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time-rs
Permit skipping `[optional]` values when formatting
Can you share some code? I'm not certain what you're referring to.
#[test]
fn test_format() {
let format =
time::macros::format_description!(version = 2, "[year]-[month]-[optional [[day]]]");
// let mut format = format_description!(version = 2, "[year]-[month]-[optional format:false [[day]]]");
// format.format_optional(false)
let date = time::Date::from_calendar_date(2024, time::Month::April, 1).unwrap();
let str = date.format(format).unwrap(); // --> format to "2024-04-"
// assert_eq!(str,"2024-04-");
println!("{:?}", str)
}
Why is this needed? Generally you should be providing as much information as possible when formatting, only inferring when parsing if absolutely necessary. The description in documentation matches this:
An item that may or may not be present while parsing. While formatting, the value is always present.
Why is this needed? Generally you should be providing as much information as possible when formatting, only inferring when parsing if absolutely necessary. The description in documentation matches this:
An item that may or may not be present while parsing. While formatting, the value is always present.
Format it into a simpler form when supporting more formats
pub const FORMAT: &[time::format_description::BorrowedFormatItem] = time::macros::format_description!(
version = 2,
"[year]-[month]-[day][first [ ] [T]][hour]:[minute]:[second][optional [[first [[end]] [.[subsecond digits:1+]]]]][optional [[first [[end]] [[offset_hour]:[offset_minute][optional [:[offset_second]]]]]]]"
);
Just like this, if I want to format the time zone without formatting milliseconds, I can't do it
Unfortunately the optional component does not permit modifiers in the current public API and said API is not marked #[non_exhaustive]. As such, it would be a breaking change to implement this. I'll add it to the list in #650.