Struct chrono::naive::time::NaiveTime

pub struct NaiveTime { /* fields omitted */ }

ISO 8601 time without timezone. Allows for the nanosecond precision and optional leap second representation.

Chrono has a notable policy on the leap second handling, designed to be maximally useful for typical users.

Methods

impl NaiveTime

fn from_hms(hour: u32, min: u32, sec: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute and second.

No leap second is allowed here; use NaiveTime::from_hms_* methods with a subsecond parameter instead.

Panics on invalid hour, minute and/or second.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms(23, 56, 4);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 0);

fn from_hms_opt(hour: u32, min: u32, sec: u32) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute and second.

No leap second is allowed here; use NaiveTime::from_hms_*_opt methods with a subsecond parameter instead.

Returns None on invalid hour, minute and/or second.

Example

use chrono::NaiveTime;

let hms = |h,m,s| NaiveTime::from_hms_opt(h, m, s);
assert!(hms(0, 0, 0).is_some());
assert!(hms(23, 59, 59).is_some());
assert!(hms(24, 0, 0).is_none());
assert!(hms(23, 60, 0).is_none());
assert!(hms(23, 59, 60).is_none());

fn from_hms_milli(hour: u32, min: u32, sec: u32, milli: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or millisecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_milli(23, 56, 4, 12);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_000_000);

fn from_hms_milli_opt(
    hour: u32,
    min: u32,
    sec: u32,
    milli: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and millisecond.

The millisecond part can exceed 1,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or millisecond.

Example

use chrono::NaiveTime;

let hmsm = |h,m,s,milli| NaiveTime::from_hms_milli_opt(h, m, s, milli);
assert!(hmsm(0, 0, 0, 0).is_some());
assert!(hmsm(23, 59, 59, 999).is_some());
assert!(hmsm(23, 59, 59, 1_999).is_some()); // a leap second following 23:59:59
assert!(hmsm(24, 0, 0, 0).is_none());
assert!(hmsm(23, 60, 0, 0).is_none());
assert!(hmsm(23, 59, 60, 0).is_none());
assert!(hmsm(23, 59, 59, 2_000).is_none());

fn from_hms_micro(hour: u32, min: u32, sec: u32, micro: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or microsecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_micro(23, 56, 4, 12_345);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_000);

fn from_hms_micro_opt(
    hour: u32,
    min: u32,
    sec: u32,
    micro: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and microsecond.

The microsecond part can exceed 1,000,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or microsecond.

Example

use chrono::NaiveTime;

let hmsu = |h,m,s,micro| NaiveTime::from_hms_micro_opt(h, m, s, micro);
assert!(hmsu(0, 0, 0, 0).is_some());
assert!(hmsu(23, 59, 59, 999_999).is_some());
assert!(hmsu(23, 59, 59, 1_999_999).is_some()); // a leap second following 23:59:59
assert!(hmsu(24, 0, 0, 0).is_none());
assert!(hmsu(23, 60, 0, 0).is_none());
assert!(hmsu(23, 59, 60, 0).is_none());
assert!(hmsu(23, 59, 59, 2_000_000).is_none());

fn from_hms_nano(hour: u32, min: u32, sec: u32, nano: u32) -> NaiveTime

Makes a new NaiveTime from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid hour, minute, second and/or nanosecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_678);

fn from_hms_nano_opt(
    hour: u32,
    min: u32,
    sec: u32,
    nano: u32
) -> Option<NaiveTime>

Makes a new NaiveTime from hour, minute, second and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns None on invalid hour, minute, second and/or nanosecond.

Example

use chrono::NaiveTime;

let hmsn = |h,m,s,nano| NaiveTime::from_hms_nano_opt(h, m, s, nano);
assert!(hmsn(0, 0, 0, 0).is_some());
assert!(hmsn(23, 59, 59, 999_999_999).is_some());
assert!(hmsn(23, 59, 59, 1_999_999_999).is_some()); // a leap second following 23:59:59
assert!(hmsn(24, 0, 0, 0).is_none());
assert!(hmsn(23, 60, 0, 0).is_none());
assert!(hmsn(23, 59, 60, 0).is_none());
assert!(hmsn(23, 59, 59, 2_000_000_000).is_none());

fn from_num_seconds_from_midnight(secs: u32, nano: u32) -> NaiveTime

Makes a new NaiveTime from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Panics on invalid number of seconds and/or nanosecond.

Example

use chrono::{NaiveTime, Timelike};

let t = NaiveTime::from_num_seconds_from_midnight(86164, 12_345_678);
assert_eq!(t.hour(), 23);
assert_eq!(t.minute(), 56);
assert_eq!(t.second(), 4);
assert_eq!(t.nanosecond(), 12_345_678);

fn from_num_seconds_from_midnight_opt(secs: u32, nano: u32) -> Option<NaiveTime>

Makes a new NaiveTime from the number of seconds since midnight and nanosecond.

The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.

Returns None on invalid number of seconds and/or nanosecond.

Example

use chrono::NaiveTime;

let secs = |secs,nano| NaiveTime::from_num_seconds_from_midnight_opt(secs, nano);
assert!(secs(0, 0).is_some());
assert!(secs(86399, 999_999_999).is_some());
assert!(secs(86399, 1_999_999_999).is_some()); // a leap second following 23:59:59
assert!(secs(86400, 0).is_none());
assert!(secs(86399, 2_000_000_000).is_none());

fn parse_from_str(s: &str, fmt: &str) -> ParseResult<NaiveTime>

Parses a string with the specified format string and returns a new NaiveTime. See the format::strftime module on the supported escape sequences.

Example

use chrono::NaiveTime;

assert_eq!(NaiveTime::parse_from_str("23:56:04", "%H:%M:%S"),
           Ok(NaiveTime::from_hms(23, 56, 4)));
assert_eq!(NaiveTime::parse_from_str("pm012345.6789", "%p%I%M%S%.f"),
           Ok(NaiveTime::from_hms_micro(13, 23, 45, 678_900)));

Date and offset is ignored for the purpose of parsing.

assert_eq!(NaiveTime::parse_from_str("2014-5-17T12:34:56+09:30", "%Y-%m-%dT%H:%M:%S%z"),
           Ok(NaiveTime::from_hms(12, 34, 56)));

Leap seconds are correctly handled by treating any time of the form hh:mm:60 as a leap second. (This equally applies to the formatting, so the round trip is possible.)

assert_eq!(NaiveTime::parse_from_str("08:59:60.123", "%H:%M:%S%.f"),
           Ok(NaiveTime::from_hms_milli(8, 59, 59, 1_123)));

Missing seconds are assumed to be zero, but out-of-bound times or insufficient fields are errors otherwise.

assert_eq!(NaiveTime::parse_from_str("7:15", "%H:%M"),
           Ok(NaiveTime::from_hms(7, 15, 0)));

assert!(NaiveTime::parse_from_str("04m33s", "%Mm%Ss").is_err());
assert!(NaiveTime::parse_from_str("12", "%H").is_err());
assert!(NaiveTime::parse_from_str("17:60", "%H:%M").is_err());
assert!(NaiveTime::parse_from_str("24:00:00", "%H:%M:%S").is_err());

All parsed fields should be consistent to each other, otherwise it's an error. Here %H is for 24-hour clocks, unlike %I, and thus can be independently determined without AM/PM.

assert!(NaiveTime::parse_from_str("13:07 AM", "%H:%M %p").is_err());

fn format_with_items<'a, I>(&self, items: I) -> DelayedFormat<I> where
    I: Iterator<Item = Item<'a>> + Clone, 

Formats the time with the specified formatting items. Otherwise it is same to the ordinary format method.

The Iterator of items should be Cloneable, since the resulting DelayedFormat value may be formatted multiple times.

Example

use chrono::NaiveTime;
use chrono::format::strftime::StrftimeItems;

let fmt = StrftimeItems::new("%H:%M:%S");
let t = NaiveTime::from_hms(23, 56, 4);
assert_eq!(t.format_with_items(fmt.clone()).to_string(), "23:56:04");
assert_eq!(t.format("%H:%M:%S").to_string(), "23:56:04");

fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>>

Formats the time with the specified format string. See the format::strftime module on the supported escape sequences.

This returns a DelayedFormat, which gets converted to a string only when actual formatting happens. You may use the to_string method to get a String, or just feed it into print! and other formatting macros. (In this way it avoids the redundant memory allocation.)

A wrong format string does not issue an error immediately. Rather, converting or formatting the DelayedFormat fails. You are recommended to immediately use DelayedFormat for this reason.

Example

use chrono::NaiveTime;

let t = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(t.format("%H:%M:%S").to_string(), "23:56:04");
assert_eq!(t.format("%H:%M:%S%.6f").to_string(), "23:56:04.012345");
assert_eq!(t.format("%-I:%M %p").to_string(), "11:56 PM");

Trait Implementations

impl PartialEq for NaiveTime

fn eq(&self, __arg_0: &NaiveTime) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &NaiveTime) -> bool

This method tests for !=.

impl Eq for NaiveTime

impl PartialOrd for NaiveTime

fn partial_cmp(&self, __arg_0: &NaiveTime) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, __arg_0: &NaiveTime) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, __arg_0: &NaiveTime) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, __arg_0: &NaiveTime) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, __arg_0: &NaiveTime) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for NaiveTime

fn cmp(&self, __arg_0: &NaiveTime) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

🔬 This is a nightly-only experimental API. (ord_max_min)

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

🔬 This is a nightly-only experimental API. (ord_max_min)

Compares and returns the minimum of two values.

impl Copy for NaiveTime

impl Clone for NaiveTime

fn clone(&self) -> NaiveTime

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Timelike for NaiveTime

fn hour(&self) -> u32

Returns the hour number from 0 to 23.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).hour(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).hour(), 23);

fn minute(&self) -> u32

Returns the minute number from 0 to 59.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).minute(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).minute(), 56);

fn second(&self) -> u32

Returns the second number from 0 to 59.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).second(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).second(), 4);

This method never returns 60 even when it is a leap second. (Why?) Use the proper formatting method to get a human-readable representation.

let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
assert_eq!(leap.second(), 59);
assert_eq!(leap.format("%H:%M:%S").to_string(), "23:59:60");

fn nanosecond(&self) -> u32

Returns the number of nanoseconds since the whole non-leap second. The range from 1,000,000,000 to 1,999,999,999 represents the leap second.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(0, 0, 0).nanosecond(), 0);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).nanosecond(), 12_345_678);

Leap seconds may have seemingly out-of-range return values. You can reduce the range with time.nanosecond() % 1_000_000_000, or use the proper formatting method to get a human-readable representation.

let leap = NaiveTime::from_hms_milli(23, 59, 59, 1_000);
assert_eq!(leap.nanosecond(), 1_000_000_000);
assert_eq!(leap.format("%H:%M:%S%.9f").to_string(), "23:59:60.000000000");

fn with_hour(&self, hour: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the hour number changed.

Returns None when the resulting NaiveTime would be invalid.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_hour(7), Some(NaiveTime::from_hms_nano(7, 56, 4, 12_345_678)));
assert_eq!(dt.with_hour(24), None);

fn with_minute(&self, min: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the minute number changed.

Returns None when the resulting NaiveTime would be invalid.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_minute(45), Some(NaiveTime::from_hms_nano(23, 45, 4, 12_345_678)));
assert_eq!(dt.with_minute(60), None);

fn with_second(&self, sec: u32) -> Option<NaiveTime>

Makes a new NaiveTime with the second number changed.

Returns None when the resulting NaiveTime would be invalid. As with the second method, the input range is restricted to 0 through 59.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_second(17), Some(NaiveTime::from_hms_nano(23, 56, 17, 12_345_678)));
assert_eq!(dt.with_second(60), None);

fn with_nanosecond(&self, nano: u32) -> Option<NaiveTime>

Makes a new NaiveTime with nanoseconds since the whole non-leap second changed.

Returns None when the resulting NaiveTime would be invalid. As with the nanosecond method, the input range can exceed 1,000,000,000 for leap seconds.

Example

use chrono::{NaiveTime, Timelike};

let dt = NaiveTime::from_hms_nano(23, 56, 4, 12_345_678);
assert_eq!(dt.with_nanosecond(333_333_333),
           Some(NaiveTime::from_hms_nano(23, 56, 4, 333_333_333)));
assert_eq!(dt.with_nanosecond(2_000_000_000), None);

Leap seconds can theoretically follow any whole second. The following would be a proper leap second at the time zone offset of UTC-00:03:57 (there are several historical examples comparable to this "non-sense" offset), and therefore is allowed.

assert_eq!(dt.with_nanosecond(1_333_333_333),
           Some(NaiveTime::from_hms_nano(23, 56, 4, 1_333_333_333)));

fn num_seconds_from_midnight(&self) -> u32

Returns the number of non-leap seconds past the last midnight.

Example

use chrono::{NaiveTime, Timelike};

assert_eq!(NaiveTime::from_hms(1, 2, 3).num_seconds_from_midnight(),
           3723);
assert_eq!(NaiveTime::from_hms_nano(23, 56, 4, 12_345_678).num_seconds_from_midnight(),
           86164);
assert_eq!(NaiveTime::from_hms_milli(23, 59, 59, 1_000).num_seconds_from_midnight(),
           86399);

fn hour12(&self) -> (bool, u32)

Returns the hour number from 1 to 12 with a boolean flag, which is false for AM and true for PM.

impl Hash for NaiveTime

NaiveTime can be used as a key to the hash maps (in principle).

Practically this also takes account of fractional seconds, so it is not recommended. (For the obvious reason this also distinguishes leap seconds from non-leap seconds.)

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Add<Duration> for NaiveTime

type Output = NaiveTime

The resulting type after applying the + operator

fn add(self, rhs: Duration) -> NaiveTime

The method for the + operator

impl Sub<NaiveTime> for NaiveTime

type Output = Duration

The resulting type after applying the - operator

fn sub(self, rhs: NaiveTime) -> Duration

The method for the - operator

impl Sub<Duration> for NaiveTime

type Output = NaiveTime

The resulting type after applying the - operator

fn sub(self, rhs: Duration) -> NaiveTime

The method for the - operator

impl Debug for NaiveTime

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Display for NaiveTime

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl FromStr for NaiveTime

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> ParseResult<NaiveTime>

Parses a string s to return a value of this type.