Function chrono::format::format

pub fn format<'a, I>(
    w: &mut Formatter, 
    date: Option<&NaiveDate>, 
    time: Option<&NaiveTime>, 
    off: Option<&(String, Duration)>, 
    items: I
) -> Result where
    I: Iterator<Item = Item<'a>>, 

Tries to format given arguments with given formatting items. Internally used by DelayedFormat.