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<p class='location'>Struct NaiveDate</p><div class="block items"><ul><li><a href="#methods">Methods</a></li><li><a href="#implementations">Trait Implementations</a></li></ul></div><p class='location'><a href='../../index.html'>chrono</a>::<wbr><a href='../index.html'>naive</a>::<wbr><a href='index.html'>date</a></p><script>window.sidebarCurrent = {name: 'NaiveDate', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>chrono</a>::<wbr><a href='../index.html'>naive</a>::<wbr><a href='index.html'>date</a>::<wbr><a class="struct" href=''>NaiveDate</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust struct'>pub struct NaiveDate { /* fields omitted */ }</pre><div class='docblock'><p>ISO 8601 calendar date without timezone.
Allows for every <a href="./index.html#calendar-date">proleptic Gregorian date</a>
from Jan 1, 262145 BCE to Dec 31, 262143 CE.
Also supports the conversion from ISO 8601 ordinal and week date.</p>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#114-888' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.from_ymd' class="method"><span id='from_ymd.v' class='invisible'><code>fn <a href='#method.from_ymd' class='fnname'>from_ymd</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, month: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, day: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#calendar-date">calendar date</a>
(year, month and day).</p>
<p>Panics on the out-of-range date, invalid month and/or day.</p>
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">3</span>, <span class="number">14</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">month</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">day</span>(), <span class="number">14</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">ordinal</span>(), <span class="number">73</span>); <span class="comment">// day of year</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">isoweekdate</span>(), (<span class="number">2015</span>, <span class="number">11</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>)); <span class="comment">// ISO week and weekday</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">num_days_from_ce</span>(), <span class="number">735671</span>); <span class="comment">// days since January 1, 1 CE</span></pre>
</div><h4 id='method.from_ymd_opt' class="method"><span id='from_ymd_opt.v' class='invisible'><code>fn <a href='#method.from_ymd_opt' class='fnname'>from_ymd_opt</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, month: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, day: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#calendar-date">calendar date</a>
(year, month and day).</p>
<p>Returns <code>None</code> on the out-of-range date, invalid month and/or day.</p>
<h1 id='example-1' class='section-header'><a href='#example-1'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd_opt</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">0</span>, <span class="number">14</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">2</span>, <span class="number">29</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="op">-</span><span class="number">4</span>, <span class="number">2</span>, <span class="number">29</span>).<span class="ident">is_some</span>()); <span class="comment">// 5 BCE is a leap year</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">400000</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="op">-</span><span class="number">400000</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.from_yo' class="method"><span id='from_yo.v' class='invisible'><code>fn <a href='#method.from_yo' class='fnname'>from_yo</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, ordinal: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#ordinal-date">ordinal date</a>
(year and day of the year).</p>
<p>Panics on the out-of-range date and/or invalid day of year.</p>
<h1 id='example-2' class='section-header'><a href='#example-2'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_yo</span>(<span class="number">2015</span>, <span class="number">73</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">ordinal</span>(), <span class="number">73</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">month</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">day</span>(), <span class="number">14</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">isoweekdate</span>(), (<span class="number">2015</span>, <span class="number">11</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>)); <span class="comment">// ISO week and weekday</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">num_days_from_ce</span>(), <span class="number">735671</span>); <span class="comment">// days since January 1, 1 CE</span></pre>
</div><h4 id='method.from_yo_opt' class="method"><span id='from_yo_opt.v' class='invisible'><code>fn <a href='#method.from_yo_opt' class='fnname'>from_yo_opt</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, ordinal: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#ordinal-date">ordinal date</a>
(year and day of the year).</p>
<p>Returns <code>None</code> on the out-of-range date and/or invalid day of year.</p>
<h1 id='example-3' class='section-header'><a href='#example-3'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">yo</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">o</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_yo_opt</span>(<span class="ident">y</span>, <span class="ident">o</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="number">2015</span>, <span class="number">100</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="number">2015</span>, <span class="number">0</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="number">2015</span>, <span class="number">365</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="number">2015</span>, <span class="number">366</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="op">-</span><span class="number">4</span>, <span class="number">366</span>).<span class="ident">is_some</span>()); <span class="comment">// 5 BCE is a leap year</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="number">400000</span>, <span class="number">1</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">yo</span>(<span class="op">-</span><span class="number">400000</span>, <span class="number">1</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.from_isoywd' class="method"><span id='from_isoywd.v' class='invisible'><code>fn <a href='#method.from_isoywd' class='fnname'>from_isoywd</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, week: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, weekday: <a class="enum" href="../../../chrono/enum.Weekday.html" title="enum chrono::Weekday">Weekday</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#week-date">ISO week date</a>
(year, week number and day of the week).
The resulting <code>NaiveDate</code> may have a different year from the input year.</p>
<p>Panics on the out-of-range date and/or invalid week number.</p>
<h1 id='example-4' class='section-header'><a href='#example-4'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_isoywd</span>(<span class="number">2015</span>, <span class="number">11</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">isoweekdate</span>(), (<span class="number">2015</span>, <span class="number">11</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">month</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">day</span>(), <span class="number">14</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">ordinal</span>(), <span class="number">73</span>); <span class="comment">// day of year</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">num_days_from_ce</span>(), <span class="number">735671</span>); <span class="comment">// days since January 1, 1 CE</span></pre>
</div><h4 id='method.from_isoywd_opt' class="method"><span id='from_isoywd_opt.v' class='invisible'><code>fn <a href='#method.from_isoywd_opt' class='fnname'>from_isoywd_opt</a>(year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, week: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, weekday: <a class="enum" href="../../../chrono/enum.Weekday.html" title="enum chrono::Weekday">Weekday</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the <a href="./index.html#week-date">ISO week date</a>
(year, week number and day of the week).
The resulting <code>NaiveDate</code> may have a different year from the input year.</p>
<p>Returns <code>None</code> on the out-of-range date and/or invalid week number.</p>
<h1 id='example-5' class='section-header'><a href='#example-5'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>);
<span class="kw">let</span> <span class="ident">isoywd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">w</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_isoywd_opt</span>(<span class="ident">y</span>, <span class="ident">w</span>, <span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">0</span>, <span class="ident">Weekday</span>::<span class="ident">Sun</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">10</span>, <span class="ident">Weekday</span>::<span class="ident">Sun</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">3</span>, <span class="number">8</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">30</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">7</span>, <span class="number">20</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">60</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">400000</span>, <span class="number">10</span>, <span class="ident">Weekday</span>::<span class="ident">Fri</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="op">-</span><span class="number">400000</span>, <span class="number">10</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>), <span class="prelude-val">None</span>);</pre>
<p>The year number of ISO week date may differ from that of the calendar date.</p>
<pre class="rust rust-example-rendered">
<span class="comment">// Mo Tu We Th Fr Sa Su</span>
<span class="comment">// 2014-W52 22 23 24 25 26 27 28 has 4+ days of new year,</span>
<span class="comment">// 2015-W01 29 30 31 1 2 3 4 &lt;- so this is the first week</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2014</span>, <span class="number">52</span>, <span class="ident">Weekday</span>::<span class="ident">Sun</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">28</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2014</span>, <span class="number">53</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">29</span>)));
<span class="comment">// 2015-W52 21 22 23 24 25 26 27 has 4+ days of old year,</span>
<span class="comment">// 2015-W53 28 29 30 31 1 2 3 &lt;- so this is the last week</span>
<span class="comment">// 2016-W01 4 5 6 7 8 9 10</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">52</span>, <span class="ident">Weekday</span>::<span class="ident">Sun</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2015</span>, <span class="number">12</span>, <span class="number">27</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">53</span>, <span class="ident">Weekday</span>::<span class="ident">Sun</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">3</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2015</span>, <span class="number">54</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">isoywd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="ident">Weekday</span>::<span class="ident">Mon</span>), <span class="prelude-val">Some</span>(<span class="ident">ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">4</span>)));</pre>
</div><h4 id='method.from_num_days_from_ce' class="method"><span id='from_num_days_from_ce.v' class='invisible'><code>fn <a href='#method.from_num_days_from_ce' class='fnname'>from_num_days_from_ce</a>(days: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the number of days since January 1, 1 (Day 1)
in the proleptic Gregorian calendar.</p>
<p>Panics on the out-of-range date.</p>
<h1 id='example-6' class='section-header'><a href='#example-6'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_num_days_from_ce</span>(<span class="number">735671</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">num_days_from_ce</span>(), <span class="number">735671</span>); <span class="comment">// days since January 1, 1 CE</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">month</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">day</span>(), <span class="number">14</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">ordinal</span>(), <span class="number">73</span>); <span class="comment">// day of year</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">isoweekdate</span>(), (<span class="number">2015</span>, <span class="number">11</span>, <span class="ident">Weekday</span>::<span class="ident">Sat</span>)); <span class="comment">// ISO week and weekday</span></pre>
<p>While not directly supported by Chrono,
it is easy to convert from the Julian day number
(January 1, 4713 BCE in the <em>Julian</em> calendar being Day 0)
to Gregorian with this method.
(Note that this panics when <code>jd</code> is out of range.)</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">fn</span> <span class="ident">jd_to_date</span>(<span class="ident">jd</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">NaiveDate</span> {
<span class="comment">// keep in mind that the Julian day number is 0-based</span>
<span class="comment">// while this method requires an 1-based number.</span>
<span class="ident">NaiveDate</span>::<span class="ident">from_num_days_from_ce</span>(<span class="ident">jd</span> <span class="op">-</span> <span class="number">1721425</span>)
}
<span class="comment">// January 1, 4713 BCE in Julian = November 24, 4714 BCE in Gregorian</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">jd_to_date</span>(<span class="number">0</span>), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">4713</span>, <span class="number">11</span>, <span class="number">24</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">jd_to_date</span>(<span class="number">1721426</span>), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">jd_to_date</span>(<span class="number">2450000</span>), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1995</span>, <span class="number">10</span>, <span class="number">9</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">jd_to_date</span>(<span class="number">2451545</span>), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2000</span>, <span class="number">1</span>, <span class="number">1</span>));</pre>
</div><h4 id='method.from_num_days_from_ce_opt' class="method"><span id='from_num_days_from_ce_opt.v' class='invisible'><code>fn <a href='#method.from_num_days_from_ce_opt' class='fnname'>from_num_days_from_ce_opt</a>(days: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> from the number of days since January 1, 1 (Day 1)
in the proleptic Gregorian calendar.</p>
<p>Returns <code>None</code> on the out-of-range date.</p>
<h1 id='example-7' class='section-header'><a href='#example-7'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">days</span> <span class="op">=</span> <span class="op">|</span><span class="ident">ndays</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_num_days_from_ce_opt</span>(<span class="ident">ndays</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="number">730000</span>), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1999</span>, <span class="number">9</span>, <span class="number">3</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="number">0</span>), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">0</span>, <span class="number">12</span>, <span class="number">31</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="op">-</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">0</span>, <span class="number">12</span>, <span class="number">30</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="number">100000000</span>), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">days</span>(<span class="op">-</span><span class="number">100000000</span>), <span class="prelude-val">None</span>);</pre>
</div><h4 id='method.parse_from_str' class="method"><span id='parse_from_str.v' class='invisible'><code>fn <a href='#method.parse_from_str' class='fnname'>parse_from_str</a>(s: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>, fmt: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="type" href="../../../chrono/format/type.ParseResult.html" title="type chrono::format::ParseResult">ParseResult</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Parses a string with the specified format string and returns a new <code>NaiveDate</code>.
See the <a href="../../format/strftime/index.html"><code>format::strftime</code> module</a>
on the supported escape sequences.</p>
<h1 id='example-8' class='section-header'><a href='#example-8'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;2015-09-05&quot;</span>, <span class="string">&quot;%Y-%m-%d&quot;</span>),
<span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;5sep2015&quot;</span>, <span class="string">&quot;%d%b%Y&quot;</span>),
<span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>)));</pre>
<p>Time and offset is ignored for the purpose of parsing.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;2014-5-17T12:34:56+09:30&quot;</span>, <span class="string">&quot;%Y-%m-%dT%H:%M:%S%z&quot;</span>),
<span class="prelude-val">Ok</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2014</span>, <span class="number">5</span>, <span class="number">17</span>)));</pre>
<p>Out-of-bound dates or insufficient fields are errors.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;2015/9&quot;</span>, <span class="string">&quot;%Y/%m&quot;</span>).<span class="ident">is_err</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;2015/9/31&quot;</span>, <span class="string">&quot;%Y/%m/%d&quot;</span>).<span class="ident">is_err</span>());</pre>
<p>All parsed fields should be consistent to each other, otherwise it&#39;s an error.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">parse_from_str</span>(<span class="string">&quot;Sat, 09 Aug 2013&quot;</span>, <span class="string">&quot;%a, %d %b %Y&quot;</span>).<span class="ident">is_err</span>());</pre>
</div><h4 id='method.and_time' class="method"><span id='and_time.v' class='invisible'><code>fn <a href='#method.and_time' class='fnname'>and_time</a>(&amp;self, time: <a class="struct" href="../../../chrono/naive/time/struct.NaiveTime.html" title="struct chrono::naive::time::NaiveTime">NaiveTime</a>) -&gt; <a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date and given <code>NaiveTime</code>.</p>
<h1 id='example-9' class='section-header'><a href='#example-9'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveTime</span>, <span class="ident">NaiveDateTime</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">NaiveTime</span>::<span class="ident">from_hms_milli</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>);
<span class="kw">let</span> <span class="ident">dt</span>: <span class="ident">NaiveDateTime</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">and_time</span>(<span class="ident">t</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">date</span>(), <span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">time</span>(), <span class="ident">t</span>);</pre>
</div><h4 id='method.and_hms' class="method"><span id='and_hms.v' class='invisible'><code>fn <a href='#method.and_hms' class='fnname'>and_hms</a>(&amp;self, hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute and second.</p>
<p>No <a href="../time/index.html#leap-second-handling">leap second</a> is allowed here;
use <code>NaiveDate::and_hms_*</code> methods with a subsecond parameter instead.</p>
<p>Panics on invalid hour, minute and/or second.</p>
<h1 id='example-10' class='section-header'><a href='#example-10'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveDateTime</span>, <span class="ident">Datelike</span>, <span class="ident">Timelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">dt</span>: <span class="ident">NaiveDateTime</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">and_hms</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Wed</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">second</span>(), <span class="number">56</span>);</pre>
</div><h4 id='method.and_hms_opt' class="method"><span id='and_hms_opt.v' class='invisible'><code>fn <a href='#method.and_hms_opt' class='fnname'>and_hms_opt</a>(&amp;self, hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute and second.</p>
<p>No <a href="../time/index.html#leap-second-handling">leap second</a> is allowed here;
use <code>NaiveDate::and_hms_*_opt</code> methods with a subsecond parameter instead.</p>
<p>Returns <code>None</code> on invalid hour, minute and/or second.</p>
<h1 id='example-11' class='section-header'><a href='#example-11'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">60</span>).<span class="ident">is_none</span>()); <span class="comment">// use `and_hms_milli_opt` instead</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_opt</span>(<span class="number">12</span>, <span class="number">60</span>, <span class="number">56</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_opt</span>(<span class="number">24</span>, <span class="number">34</span>, <span class="number">56</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.and_hms_milli' class="method"><span id='and_hms_milli.v' class='invisible'><code>fn <a href='#method.and_hms_milli' class='fnname'>and_hms_milli</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;milli: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and millisecond.</p>
<p>The millisecond part can exceed 1,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Panics on invalid hour, minute, second and/or millisecond.</p>
<h1 id='example-12' class='section-header'><a href='#example-12'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveDateTime</span>, <span class="ident">Datelike</span>, <span class="ident">Timelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">dt</span>: <span class="ident">NaiveDateTime</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">and_hms_milli</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Wed</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">second</span>(), <span class="number">56</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">nanosecond</span>(), <span class="number">789_000_000</span>);</pre>
</div><h4 id='method.and_hms_milli_opt' class="method"><span id='and_hms_milli_opt.v' class='invisible'><code>fn <a href='#method.and_hms_milli_opt' class='fnname'>and_hms_milli_opt</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;milli: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and millisecond.</p>
<p>The millisecond part can exceed 1,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Returns <code>None</code> on invalid hour, minute, second and/or millisecond.</p>
<h1 id='example-13' class='section-header'><a href='#example-13'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">1_789</span>).<span class="ident">is_some</span>()); <span class="comment">// leap second</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">2_789</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">60</span>, <span class="number">789</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">12</span>, <span class="number">60</span>, <span class="number">56</span>, <span class="number">789</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_milli_opt</span>(<span class="number">24</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.and_hms_micro' class="method"><span id='and_hms_micro.v' class='invisible'><code>fn <a href='#method.and_hms_micro' class='fnname'>and_hms_micro</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;micro: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and microsecond.</p>
<p>The microsecond part can exceed 1,000,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Panics on invalid hour, minute, second and/or microsecond.</p>
<h1 id='example-14' class='section-header'><a href='#example-14'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveDateTime</span>, <span class="ident">Datelike</span>, <span class="ident">Timelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">dt</span>: <span class="ident">NaiveDateTime</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">and_hms_micro</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Wed</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">second</span>(), <span class="number">56</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">nanosecond</span>(), <span class="number">789_012_000</span>);</pre>
</div><h4 id='method.and_hms_micro_opt' class="method"><span id='and_hms_micro_opt.v' class='invisible'><code>fn <a href='#method.and_hms_micro_opt' class='fnname'>and_hms_micro_opt</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;micro: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and microsecond.</p>
<p>The microsecond part can exceed 1,000,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Returns <code>None</code> on invalid hour, minute, second and/or microsecond.</p>
<h1 id='example-15' class='section-header'><a href='#example-15'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">1_789_012</span>).<span class="ident">is_some</span>()); <span class="comment">// leap second</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">2_789_012</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">60</span>, <span class="number">789_012</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">12</span>, <span class="number">60</span>, <span class="number">56</span>, <span class="number">789_012</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_micro_opt</span>(<span class="number">24</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.and_hms_nano' class="method"><span id='and_hms_nano.v' class='invisible'><code>fn <a href='#method.and_hms_nano' class='fnname'>and_hms_nano</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;nano: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and nanosecond.</p>
<p>The nanosecond part can exceed 1,000,000,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Panics on invalid hour, minute, second and/or nanosecond.</p>
<h1 id='example-16' class='section-header'><a href='#example-16'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">NaiveDateTime</span>, <span class="ident">Datelike</span>, <span class="ident">Timelike</span>, <span class="ident">Weekday</span>};
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="kw">let</span> <span class="ident">dt</span>: <span class="ident">NaiveDateTime</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">and_hms_nano</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012_345</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Wed</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">second</span>(), <span class="number">56</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">dt</span>.<span class="ident">nanosecond</span>(), <span class="number">789_012_345</span>);</pre>
</div><h4 id='method.and_hms_nano_opt' class="method"><span id='and_hms_nano_opt.v' class='invisible'><code>fn <a href='#method.and_hms_nano_opt' class='fnname'>and_hms_nano_opt</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;self, <br>&nbsp;&nbsp;&nbsp;&nbsp;hour: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;min: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;sec: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;nano: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/datetime/struct.NaiveDateTime.html" title="struct chrono::naive::datetime::NaiveDateTime">NaiveDateTime</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDateTime</code> from the current date, hour, minute, second and nanosecond.</p>
<p>The nanosecond part can exceed 1,000,000,000
in order to represent the <a href="../time/index.html#leap-second-handling">leap second</a>.</p>
<p>Returns <code>None</code> on invalid hour, minute, second and/or nanosecond.</p>
<h1 id='example-17' class='section-header'><a href='#example-17'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012_345</span>).<span class="ident">is_some</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">1_789_012_345</span>).<span class="ident">is_some</span>()); <span class="comment">// leap second</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">59</span>, <span class="number">2_789_012_345</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">12</span>, <span class="number">34</span>, <span class="number">60</span>, <span class="number">789_012_345</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">12</span>, <span class="number">60</span>, <span class="number">56</span>, <span class="number">789_012_345</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">and_hms_nano_opt</span>(<span class="number">24</span>, <span class="number">34</span>, <span class="number">56</span>, <span class="number">789_012_345</span>).<span class="ident">is_none</span>());</pre>
</div><h4 id='method.succ' class="method"><span id='succ.v' class='invisible'><code>fn <a href='#method.succ' class='fnname'>succ</a>(&amp;self) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> for the next calendar date.</p>
<p>Panics when <code>self</code> is the last representable date.</p>
<h1 id='example-18' class='section-header'><a href='#example-18'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>).<span class="ident">succ</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">30</span>).<span class="ident">succ</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">7</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">12</span>, <span class="number">31</span>).<span class="ident">succ</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">1</span>));</pre>
</div><h4 id='method.succ_opt' class="method"><span id='succ_opt.v' class='invisible'><code>fn <a href='#method.succ_opt' class='fnname'>succ_opt</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> for the next calendar date.</p>
<p>Returns <code>None</code> when <code>self</code> is the last representable date.</p>
<h1 id='example-19' class='section-header'><a href='#example-19'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">naive</span>::<span class="ident">date</span>::<span class="ident">MAX</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>).<span class="ident">succ_opt</span>(),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">4</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MAX</span>.<span class="ident">succ_opt</span>(), <span class="prelude-val">None</span>);</pre>
</div><h4 id='method.pred' class="method"><span id='pred.v' class='invisible'><code>fn <a href='#method.pred' class='fnname'>pred</a>(&amp;self) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> for the previous calendar date.</p>
<p>Panics when <code>self</code> is the first representable date.</p>
<h1 id='example-20' class='section-header'><a href='#example-20'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>).<span class="ident">pred</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">1</span>).<span class="ident">pred</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">5</span>, <span class="number">31</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">pred</span>(), <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>));</pre>
</div><h4 id='method.pred_opt' class="method"><span id='pred_opt.v' class='invisible'><code>fn <a href='#method.pred_opt' class='fnname'>pred_opt</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> for the previous calendar date.</p>
<p>Returns <code>None</code> when <code>self</code> is the first representable date.</p>
<h1 id='example-21' class='section-header'><a href='#example-21'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">naive</span>::<span class="ident">date</span>::<span class="ident">MIN</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">3</span>).<span class="ident">pred_opt</span>(),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">6</span>, <span class="number">2</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MIN</span>.<span class="ident">pred_opt</span>(), <span class="prelude-val">None</span>);</pre>
</div><h4 id='method.checked_add' class="method"><span id='checked_add.v' class='invisible'><code>fn <a href='#method.checked_add' class='fnname'>checked_add</a>(self, rhs: <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Adds the <code>days</code> part of given <code>Duration</code> to the current date.</p>
<p>Returns <code>None</code> when it will result in overflow.</p>
<h1 id='example-22' class='section-header'><a href='#example-22'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Duration</span>};
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">naive</span>::<span class="ident">date</span>::<span class="ident">MAX</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">40</span>)), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">10</span>, <span class="number">15</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">40</span>)), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">7</span>, <span class="number">27</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1000_000_000</span>)), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">1000_000_000</span>)), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MAX</span>.<span class="ident">checked_add</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1</span>)), <span class="prelude-val">None</span>);</pre>
</div><h4 id='method.checked_sub' class="method"><span id='checked_sub.v' class='invisible'><code>fn <a href='#method.checked_sub' class='fnname'>checked_sub</a>(self, rhs: <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Subtracts the <code>days</code> part of given <code>Duration</code> from the current date.</p>
<p>Returns <code>None</code> when it will result in overflow.</p>
<h1 id='example-23' class='section-header'><a href='#example-23'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Duration</span>};
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">naive</span>::<span class="ident">date</span>::<span class="ident">MIN</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_sub</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">40</span>)), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">7</span>, <span class="number">27</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_sub</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">40</span>)), <span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">10</span>, <span class="number">15</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_sub</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1000_000_000</span>)), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">checked_sub</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">1000_000_000</span>)), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">MIN</span>.<span class="ident">checked_sub</span>(<span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1</span>)), <span class="prelude-val">None</span>);</pre>
</div><h4 id='method.format_with_items' class="method"><span id='format_with_items.v' class='invisible'><code>fn <a href='#method.format_with_items' class='fnname'>format_with_items</a>&lt;'a, I&gt;(&amp;self, items: I) -&gt; <a class="struct" href="../../../chrono/format/struct.DelayedFormat.html" title="struct chrono::format::DelayedFormat">DelayedFormat</a>&lt;I&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>&lt;Item = <a class="enum" href="../../../chrono/format/enum.Item.html" title="enum chrono::format::Item">Item</a>&lt;'a&gt;&gt; + <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></code></span></h4>
<div class='docblock'><p>Formats the date with the specified formatting items.
Otherwise it is same to the ordinary <code>format</code> method.</p>
<p>The <code>Iterator</code> of items should be <code>Clone</code>able,
since the resulting <code>DelayedFormat</code> value may be formatted multiple times.</p>
<h1 id='example-24' class='section-header'><a href='#example-24'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">format</span>::<span class="ident">strftime</span>::<span class="ident">StrftimeItems</span>;
<span class="kw">let</span> <span class="ident">fmt</span> <span class="op">=</span> <span class="ident">StrftimeItems</span>::<span class="ident">new</span>(<span class="string">&quot;%Y-%m-%d&quot;</span>);
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">format_with_items</span>(<span class="ident">fmt</span>.<span class="ident">clone</span>()).<span class="ident">to_string</span>(), <span class="string">&quot;2015-09-05&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">format</span>(<span class="string">&quot;%Y-%m-%d&quot;</span>).<span class="ident">to_string</span>(), <span class="string">&quot;2015-09-05&quot;</span>);</pre>
</div><h4 id='method.format' class="method"><span id='format.v' class='invisible'><code>fn <a href='#method.format' class='fnname'>format</a>&lt;'a&gt;(&amp;self, fmt: &amp;'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="struct" href="../../../chrono/format/struct.DelayedFormat.html" title="struct chrono::format::DelayedFormat">DelayedFormat</a>&lt;<a class="struct" href="../../../chrono/format/strftime/struct.StrftimeItems.html" title="struct chrono::format::strftime::StrftimeItems">StrftimeItems</a>&lt;'a&gt;&gt;</code></span></h4>
<div class='docblock'><p>Formats the date with the specified format string.
See the <a href="../../format/strftime/index.html"><code>format::strftime</code> module</a>
on the supported escape sequences.</p>
<p>This returns a <code>DelayedFormat</code>,
which gets converted to a string only when actual formatting happens.
You may use the <code>to_string</code> method to get a <code>String</code>,
or just feed it into <code>print!</code> and other formatting macros.
(In this way it avoids the redundant memory allocation.)</p>
<p>A wrong format string does <em>not</em> issue an error immediately.
Rather, converting or formatting the <code>DelayedFormat</code> fails.
You are recommended to immediately use <code>DelayedFormat</code> for this reason.</p>
<h1 id='example-25' class='section-header'><a href='#example-25'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">format</span>(<span class="string">&quot;%Y-%m-%d&quot;</span>).<span class="ident">to_string</span>(), <span class="string">&quot;2015-09-05&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">d</span>.<span class="ident">format</span>(<span class="string">&quot;%A, %-d %B, %C%y&quot;</span>).<span class="ident">to_string</span>(), <span class="string">&quot;Saturday, 5 September, 2015&quot;</span>);</pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.partial_cmp' class="method"><span id='partial_cmp.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#tymethod.partial_cmp' class='fnname'>partial_cmp</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>&gt;</code></span></h4>
<div class='docblock'><p>This method returns an ordering between <code>self</code> and <code>other</code> values if one exists. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#tymethod.partial_cmp">Read more</a></p>
</div><h4 id='method.lt' class="method"><span id='lt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.lt' class='fnname'>lt</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests less than (for <code>self</code> and <code>other</code>) and is used by the <code>&lt;</code> operator. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.lt">Read more</a></p>
</div><h4 id='method.le' class="method"><span id='le.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.le' class='fnname'>le</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests less than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code>&lt;=</code> operator. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.le">Read more</a></p>
</div><h4 id='method.gt' class="method"><span id='gt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.gt' class='fnname'>gt</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests greater than (for <code>self</code> and <code>other</code>) and is used by the <code>&gt;</code> operator. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.gt">Read more</a></p>
</div><h4 id='method.ge' class="method"><span id='ge.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.ge' class='fnname'>ge</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span></h4>
<div class='docblock'><p>This method tests greater than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code>&gt;=</code> operator. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html#method.ge">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.cmp' class="method"><span id='cmp.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#tymethod.cmp' class='fnname'>cmp</a>(&amp;self, __arg_0: &amp;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a></code></span></h4>
<div class='docblock'><p>This method returns an <code>Ordering</code> between <code>self</code> and <code>other</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#tymethod.cmp">Read more</a></p>
</div><h4 id='method.max' class="method"><span id='max.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#method.max' class='fnname'>max</a>(self, other: Self) -&gt; Self</code></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>ord_max_min</code>)</div></div><div class='docblock'><p>Compares and returns the maximum of two values. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#method.max">Read more</a></p>
</div><h4 id='method.min' class="method"><span id='min.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#method.min' class='fnname'>min</a>(self, other: Self) -&gt; Self</code></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>ord_max_min</code>)</div></div><div class='docblock'><p>Compares and returns the minimum of two values. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html#method.min">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#93' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: &amp;Self)</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></span></h4>
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="../../../chrono/trait.Datelike.html" title="trait chrono::Datelike">Datelike</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#890-1242' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.year' class="method"><span id='year.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.year' class='fnname'>year</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code></span></h4>
<div class='docblock'><p>Returns the year number in the <a href="./index.html#calendar-date">calendar date</a>.</p>
<h1 id='example-26' class='section-header'><a href='#example-26'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">year</span>(), <span class="number">2015</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">year</span>(), <span class="op">-</span><span class="number">308</span>); <span class="comment">// 309 BCE</span></pre>
</div><h4 id='method.month' class="method"><span id='month.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.month' class='fnname'>month</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the month number starting from 1.</p>
<p>The return value ranges from 1 to 12.</p>
<h1 id='example-27' class='section-header'><a href='#example-27'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">month</span>(), <span class="number">9</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">month</span>(), <span class="number">3</span>);</pre>
</div><h4 id='method.month0' class="method"><span id='month0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.month0' class='fnname'>month0</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the month number starting from 0.</p>
<p>The return value ranges from 0 to 11.</p>
<h1 id='example-28' class='section-header'><a href='#example-28'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">month0</span>(), <span class="number">8</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">month0</span>(), <span class="number">2</span>);</pre>
</div><h4 id='method.day' class="method"><span id='day.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.day' class='fnname'>day</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the day of month starting from 1.</p>
<p>The return value ranges from 1 to 31. (The last day of month differs by months.)</p>
<h1 id='example-29' class='section-header'><a href='#example-29'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">day</span>(), <span class="number">8</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">day</span>(), <span class="number">14</span>);</pre>
<p>Combined with <a href="./struct.NaiveDate.html#method.pred"><code>NaiveDate::pred</code></a>,
one can determine the number of days in a particular month.
(Note that this panics when <code>year</code> is out of range.)</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="kw">fn</span> <span class="ident">ndays_in_month</span>(<span class="ident">year</span>: <span class="ident">i32</span>, <span class="ident">month</span>: <span class="ident">u32</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> {
<span class="comment">// the first day of the next month...</span>
<span class="kw">let</span> (<span class="ident">y</span>, <span class="ident">m</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">month</span> <span class="op">==</span> <span class="number">12</span> { (<span class="ident">year</span> <span class="op">+</span> <span class="number">1</span>, <span class="number">1</span>) } <span class="kw">else</span> { (<span class="ident">year</span>, <span class="ident">month</span> <span class="op">+</span> <span class="number">1</span>) };
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="number">1</span>);
<span class="comment">// ...is preceded by the last day of the original month</span>
<span class="ident">d</span>.<span class="ident">pred</span>().<span class="ident">day</span>()
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_month</span>(<span class="number">2015</span>, <span class="number">8</span>), <span class="number">31</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_month</span>(<span class="number">2015</span>, <span class="number">9</span>), <span class="number">30</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_month</span>(<span class="number">2015</span>, <span class="number">12</span>), <span class="number">31</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_month</span>(<span class="number">2016</span>, <span class="number">2</span>), <span class="number">29</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_month</span>(<span class="number">2017</span>, <span class="number">2</span>), <span class="number">28</span>);</pre>
</div><h4 id='method.day0' class="method"><span id='day0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.day0' class='fnname'>day0</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the day of month starting from 0.</p>
<p>The return value ranges from 0 to 30. (The last day of month differs by months.)</p>
<h1 id='example-30' class='section-header'><a href='#example-30'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">day0</span>(), <span class="number">7</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">day0</span>(), <span class="number">13</span>);</pre>
</div><h4 id='method.ordinal' class="method"><span id='ordinal.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.ordinal' class='fnname'>ordinal</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the day of year starting from 1.</p>
<p>The return value ranges from 1 to 366. (The last day of year differs by years.)</p>
<h1 id='example-31' class='section-header'><a href='#example-31'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">ordinal</span>(), <span class="number">251</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">ordinal</span>(), <span class="number">74</span>);</pre>
<p>Combined with <a href="./struct.NaiveDate.html#method.pred"><code>NaiveDate::pred</code></a>,
one can determine the number of days in a particular year.
(Note that this panics when <code>year</code> is out of range.)</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="kw">fn</span> <span class="ident">ndays_in_year</span>(<span class="ident">year</span>: <span class="ident">i32</span>) <span class="op">-&gt;</span> <span class="ident">u32</span> {
<span class="comment">// the first day of the next year...</span>
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">year</span> <span class="op">+</span> <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>);
<span class="comment">// ...is preceded by the last day of the original year</span>
<span class="ident">d</span>.<span class="ident">pred</span>().<span class="ident">ordinal</span>()
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_year</span>(<span class="number">2015</span>), <span class="number">365</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_year</span>(<span class="number">2016</span>), <span class="number">366</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_year</span>(<span class="number">2017</span>), <span class="number">365</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_year</span>(<span class="number">2000</span>), <span class="number">366</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ndays_in_year</span>(<span class="number">2100</span>), <span class="number">365</span>);</pre>
</div><h4 id='method.ordinal0' class="method"><span id='ordinal0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.ordinal0' class='fnname'>ordinal0</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code></span></h4>
<div class='docblock'><p>Returns the day of year starting from 0.</p>
<p>The return value ranges from 0 to 365. (The last day of year differs by years.)</p>
<h1 id='example-32' class='section-header'><a href='#example-32'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">ordinal0</span>(), <span class="number">250</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">ordinal0</span>(), <span class="number">73</span>);</pre>
</div><h4 id='method.weekday' class="method"><span id='weekday.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.weekday' class='fnname'>weekday</a>(&amp;self) -&gt; <a class="enum" href="../../../chrono/enum.Weekday.html" title="enum chrono::Weekday">Weekday</a></code></span></h4>
<div class='docblock'><p>Returns the day of week.</p>
<h1 id='example-33' class='section-header'><a href='#example-33'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>, <span class="ident">Weekday</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Tue</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">3</span>, <span class="number">14</span>).<span class="ident">weekday</span>(), <span class="ident">Weekday</span>::<span class="ident">Fri</span>);</pre>
</div><h4 id='method.isoweekdate' class="method"><span id='isoweekdate.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.isoweekdate' class='fnname'>isoweekdate</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>, <a class="enum" href="../../../chrono/enum.Weekday.html" title="enum chrono::Weekday">Weekday</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></code></span></h4>
<div class='docblock'><p>Returns the ISO week date: an adjusted year, week number and day of week. The adjusted year may differ from that of the calendar date. <a href="../../../chrono/trait.Datelike.html#tymethod.isoweekdate">Read more</a></p>
</div><h4 id='method.with_year' class="method"><span id='with_year.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_year' class='fnname'>with_year</a>(&amp;self, year: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the year number changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-34' class='section-header'><a href='#example-34'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_year</span>(<span class="number">2016</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">9</span>, <span class="number">8</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_year</span>(<span class="op">-</span><span class="number">308</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="op">-</span><span class="number">308</span>, <span class="number">9</span>, <span class="number">8</span>)));</pre>
<p>A leap day (February 29) is a good example that this method can return <code>None</code>.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">2</span>, <span class="number">29</span>).<span class="ident">with_year</span>(<span class="number">2015</span>).<span class="ident">is_none</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">2</span>, <span class="number">29</span>).<span class="ident">with_year</span>(<span class="number">2020</span>).<span class="ident">is_some</span>());</pre>
</div><h4 id='method.with_month' class="method"><span id='with_month.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_month' class='fnname'>with_month</a>(&amp;self, month: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the month number (starting from 1) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-35' class='section-header'><a href='#example-35'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_month</span>(<span class="number">10</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">10</span>, <span class="number">8</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_month</span>(<span class="number">13</span>), <span class="prelude-val">None</span>); <span class="comment">// no month 13</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">30</span>).<span class="ident">with_month</span>(<span class="number">2</span>), <span class="prelude-val">None</span>); <span class="comment">// no February 30</span></pre>
</div><h4 id='method.with_month0' class="method"><span id='with_month0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_month0' class='fnname'>with_month0</a>(&amp;self, month0: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the month number (starting from 0) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-36' class='section-header'><a href='#example-36'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_month0</span>(<span class="number">9</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">10</span>, <span class="number">8</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_month0</span>(<span class="number">12</span>), <span class="prelude-val">None</span>); <span class="comment">// no month 13</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">30</span>).<span class="ident">with_month0</span>(<span class="number">1</span>), <span class="prelude-val">None</span>); <span class="comment">// no February 30</span></pre>
</div><h4 id='method.with_day' class="method"><span id='with_day.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_day' class='fnname'>with_day</a>(&amp;self, day: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the day of month (starting from 1) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-37' class='section-header'><a href='#example-37'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_day</span>(<span class="number">30</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">30</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_day</span>(<span class="number">31</span>),
<span class="prelude-val">None</span>); <span class="comment">// no September 31</span></pre>
</div><h4 id='method.with_day0' class="method"><span id='with_day0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_day0' class='fnname'>with_day0</a>(&amp;self, day0: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the day of month (starting from 0) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-38' class='section-header'><a href='#example-38'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_day0</span>(<span class="number">29</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">30</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">8</span>).<span class="ident">with_day0</span>(<span class="number">30</span>),
<span class="prelude-val">None</span>); <span class="comment">// no September 31</span></pre>
</div><h4 id='method.with_ordinal' class="method"><span id='with_ordinal.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_ordinal' class='fnname'>with_ordinal</a>(&amp;self, ordinal: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the day of year (starting from 1) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-39' class='section-header'><a href='#example-39'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal</span>(<span class="number">60</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">3</span>, <span class="number">1</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal</span>(<span class="number">366</span>),
<span class="prelude-val">None</span>); <span class="comment">// 2015 had only 365 days</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal</span>(<span class="number">60</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">2</span>, <span class="number">29</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal</span>(<span class="number">366</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">12</span>, <span class="number">31</span>)));</pre>
</div><h4 id='method.with_ordinal0' class="method"><span id='with_ordinal0.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#tymethod.with_ordinal0' class='fnname'>with_ordinal0</a>(&amp;self, ordinal0: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Makes a new <code>NaiveDate</code> with the day of year (starting from 0) changed.</p>
<p>Returns <code>None</code> when the resulting <code>NaiveDate</code> would be invalid.</p>
<h1 id='example-40' class='section-header'><a href='#example-40'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Datelike</span>};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal0</span>(<span class="number">59</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">3</span>, <span class="number">1</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal0</span>(<span class="number">365</span>),
<span class="prelude-val">None</span>); <span class="comment">// 2015 had only 365 days</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal0</span>(<span class="number">59</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">2</span>, <span class="number">29</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">1</span>, <span class="number">1</span>).<span class="ident">with_ordinal0</span>(<span class="number">365</span>),
<span class="prelude-val">Some</span>(<span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2016</span>, <span class="number">12</span>, <span class="number">31</span>)));</pre>
</div><h4 id='method.year_ce' class="method"><span id='year_ce.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#method.year_ce' class='fnname'>year_ce</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></code></span></h4>
<div class='docblock'><p>Returns the absolute year number starting from 1 with a boolean flag, which is false when the year predates the epoch (BCE/BC) and true otherwise (CE/AD). <a href="../../../chrono/trait.Datelike.html#method.year_ce">Read more</a></p>
</div><h4 id='method.num_days_from_ce' class="method"><span id='num_days_from_ce.v' class='invisible'><code>fn <a href='../../../chrono/trait.Datelike.html#method.num_days_from_ce' class='fnname'>num_days_from_ce</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code></span></h4>
<div class='docblock'><p>Returns the number of days since January 1, 1 (Day 1) in the proleptic Gregorian calendar.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1245-1250' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p><code>NaiveDate</code> can be used as a key to the hash maps.</p>
</div><div class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a>&lt;H:&nbsp;<a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>&gt;(&amp;self, state: &amp;mut H)</code></span></h4>
<div class='docblock'><p>Feeds this value into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash">Read more</a></p>
</div><h4 id='method.hash_slice' class="method"><span id='hash_slice.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a>&lt;H&gt;(data: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[Self]</a>, state: &amp;mut H) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>,&nbsp;</span></code><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div></span></h4>
<div class='docblock'><p>Feeds a slice of this type into the given [<code>Hasher</code>]. <a href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Add.html" title="trait core::ops::arith::Add">Add</a>&lt;<a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>&gt; for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1273-1280' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>An addition of <code>Duration</code> to <code>NaiveDate</code> discards the fractional days,
rounding to the closest integral number of days towards <code>Duration::zero()</code>.</p>
<p>Panics on underflow or overflow.
Use <a href="#method.checked_add"><code>NaiveDate::checked_add</code></a> to detect that.</p>
<h1 id='example-41' class='section-header'><a href='#example-41'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Duration</span>};
<span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">zero</span>(), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">86399</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="op">-</span><span class="number">86399</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">12</span>, <span class="number">31</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">364</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">12</span>, <span class="number">31</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">4</span> <span class="op">+</span> <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2018</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">400</span> <span class="op">+</span> <span class="number">97</span>), <span class="ident">ymd</span>(<span class="number">2414</span>, <span class="number">1</span>, <span class="number">1</span>));</pre>
</div><div class='impl-items'><h4 id='associatedtype.Output' class="type"><span id='Output.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Add.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>+</code> operator</p>
</div><h4 id='method.add' class="method"><span id='add.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Add.html#tymethod.add' class='fnname'>add</a>(self, rhs: <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>The method for the <code>+</code> operator</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html" title="trait core::ops::arith::Sub">Sub</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt; for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1301-1313' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>A subtraction of <code>NaiveDate</code> from <code>NaiveDate</code> yields a <code>Duration</code> of integral numbers.</p>
<p>This does not overflow or underflow at all,
as all possible output fits in the range of <code>Duration</code>.</p>
<h1 id='example-42' class='section-header'><a href='#example-42'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Duration</span>};
<span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>), <span class="ident">Duration</span>::<span class="ident">zero</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">12</span>, <span class="number">31</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">2</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">9</span>, <span class="number">23</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">100</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">1</span>, <span class="number">1</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">2010</span>, <span class="number">1</span>, <span class="number">1</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">4</span> <span class="op">+</span> <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">ymd</span>(<span class="number">1614</span>, <span class="number">1</span>, <span class="number">1</span>), <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">400</span> <span class="op">+</span> <span class="number">97</span>));</pre>
</div><div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><span id='Output.t-1' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>-</code> operator</p>
</div><h4 id='method.sub' class="method"><span id='sub.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html#tymethod.sub' class='fnname'>sub</a>(self, rhs: <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>) -&gt; <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a></code></span></h4>
<div class='docblock'><p>The method for the <code>-</code> operator</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html" title="trait core::ops::arith::Sub">Sub</a>&lt;<a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>&gt; for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1336-1343' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>A subtraction of <code>Duration</code> from <code>NaiveDate</code> discards the fractional days,
rounding to the closest integral number of days towards <code>Duration::zero()</code>.</p>
<p>Panics on underflow or overflow.
Use <a href="#method.checked_sub"><code>NaiveDate::checked_sub</code></a> to detect that.</p>
<h1 id='example-43' class='section-header'><a href='#example-43'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::{<span class="ident">NaiveDate</span>, <span class="ident">Duration</span>};
<span class="kw">let</span> <span class="ident">ymd</span> <span class="op">=</span> <span class="op">|</span><span class="ident">y</span>,<span class="ident">m</span>,<span class="ident">d</span><span class="op">|</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="ident">y</span>, <span class="ident">m</span>, <span class="ident">d</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">zero</span>(), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="number">86399</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">seconds</span>(<span class="op">-</span><span class="number">86399</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">12</span>, <span class="number">31</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="op">-</span><span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">364</span>), <span class="ident">ymd</span>(<span class="number">2013</span>, <span class="number">1</span>, <span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">4</span> <span class="op">+</span> <span class="number">1</span>), <span class="ident">ymd</span>(<span class="number">2010</span>, <span class="number">1</span>, <span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ymd</span>(<span class="number">2014</span>, <span class="number">1</span>, <span class="number">1</span>) <span class="op">-</span> <span class="ident">Duration</span>::<span class="ident">days</span>(<span class="number">365</span><span class="kw-2">*</span><span class="number">400</span> <span class="op">+</span> <span class="number">97</span>), <span class="ident">ymd</span>(<span class="number">1614</span>, <span class="number">1</span>, <span class="number">1</span>));</pre>
</div><div class='impl-items'><h4 id='associatedtype.Output-2' class="type"><span id='Output.t-2' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>-</code> operator</p>
</div><h4 id='method.sub-1' class="method"><span id='sub.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/arith/trait.Sub.html#tymethod.sub' class='fnname'>sub</a>(self, rhs: <a class="struct" href="../../../chrono/duration/struct.Duration.html" title="struct chrono::duration::Duration">Duration</a>) -&gt; <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span></h4>
<div class='docblock'><p>The method for the <code>-</code> operator</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1366-1377' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>The <code>Debug</code> output of the naive date <code>d</code> is same to <code>d.format(&quot;%Y-%m-%d&quot;)</code>.</p>
<p>The string printed can be readily parsed via the <code>parse</code> method on <code>str</code>.</p>
<h1 id='example-44' class='section-header'><a href='#example-44'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>)), <span class="string">&quot;2015-09-05&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>( <span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>)), <span class="string">&quot;0000-01-01&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">9999</span>, <span class="number">12</span>, <span class="number">31</span>)), <span class="string">&quot;9999-12-31&quot;</span>);</pre>
<p>ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>( <span class="op">-</span><span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>)), <span class="string">&quot;-0001-01-01&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">10000</span>, <span class="number">12</span>, <span class="number">31</span>)), <span class="string">&quot;+10000-12-31&quot;</span>);</pre>
</div><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></h4>
<div class='docblock'><p>Formats the value using the given formatter.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1400-1402' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>The <code>Display</code> output of the naive date <code>d</code> is same to <code>d.format(&quot;%Y-%m-%d&quot;)</code>.</p>
<p>The string printed can be readily parsed via the <code>parse</code> method on <code>str</code>.</p>
<h1 id='example-45' class='section-header'><a href='#example-45'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">5</span>)), <span class="string">&quot;2015-09-05&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>( <span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>)), <span class="string">&quot;0000-01-01&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">9999</span>, <span class="number">12</span>, <span class="number">31</span>)), <span class="string">&quot;9999-12-31&quot;</span>);</pre>
<p>ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.</p>
<pre class="rust rust-example-rendered">
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>( <span class="op">-</span><span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>)), <span class="string">&quot;-0001-01-01&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">10000</span>, <span class="number">12</span>, <span class="number">31</span>)), <span class="string">&quot;+10000-12-31&quot;</span>);</pre>
</div><div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html" title="trait core::str::FromStr">FromStr</a> for <a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/chrono/naive/date.rs.html#1419-1436' title='goto source code'>[src]</a></span></h3>
<div class='docblock'><p>Parsing a str into a <code>NaiveDate</code> uses the same format, <code>%Y-%m-%d</code>, as <code>Debug</code> and <code>Display</code>.</p>
<h1 id='example-46' class='section-header'><a href='#example-46'>Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">chrono</span>::<span class="ident">NaiveDate</span>;
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">2015</span>, <span class="number">9</span>, <span class="number">18</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">d</span>).<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">NaiveDate</span><span class="op">&gt;</span>(), <span class="prelude-val">Ok</span>(<span class="ident">d</span>));
<span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">NaiveDate</span>::<span class="ident">from_ymd</span>(<span class="number">12345</span>, <span class="number">6</span>, <span class="number">7</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">d</span>).<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">NaiveDate</span><span class="op">&gt;</span>(), <span class="prelude-val">Ok</span>(<span class="ident">d</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="string">&quot;foo&quot;</span>.<span class="ident">parse</span>::<span class="op">&lt;</span><span class="ident">NaiveDate</span><span class="op">&gt;</span>().<span class="ident">is_err</span>());</pre>
</div><div class='impl-items'><h4 id='associatedtype.Err' class="type"><span id='Err.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#associatedtype.Err' class="type">Err</a> = <a class="struct" href="../../../chrono/format/struct.ParseError.html" title="struct chrono::format::ParseError">ParseError</a></code></span></h4>
<div class='docblock'><p>The associated error which can be returned from parsing.</p>
</div><h4 id='method.from_str' class="method"><span id='from_str.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#tymethod.from_str' class='fnname'>from_str</a>(s: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) -&gt; <a class="type" href="../../../chrono/format/type.ParseResult.html" title="type chrono::format::ParseResult">ParseResult</a>&lt;<a class="struct" href="../../../chrono/naive/date/struct.NaiveDate.html" title="struct chrono::naive::date::NaiveDate">NaiveDate</a>&gt;</code></span></h4>
<div class='docblock'><p>Parses a string <code>s</code> to return a value of this type. <a href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#tymethod.from_str">Read more</a></p>
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