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add DateTime::from_local()

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retrhelo 2021-07-01 13:39:06 +08:00
parent 3467172c31
commit f4302b5b52
2 changed files with 48 additions and 0 deletions
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CHANGELOG.md
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@ -17,6 +17,7 @@ Versions with only mechanical changes will be omitted from the following list.
* Add support for microseconds timestamps serde serialization/deserialization (#304)
* Fix `DurationRound` is not TZ aware (#495)
* Implement `DurationRound` for `NaiveDateTime`
* Add `DateTime::from_local()` to construct from given local date and time
## 0.4.19

47
src/datetime.rs
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@ -96,6 +96,33 @@ impl<Tz: TimeZone> DateTime<Tz> {
DateTime { datetime: datetime, offset: offset }
}
/// Makes a new `DateTime` with given **local** datetime and offset that
/// presents local timezone.
///
/// # Example
///
/// ```
/// let naivedatetime_utc = NaiveDate::from_ymd(2000, 1, 12).and_hms(2, 0, 0);
/// let datetime_utc = DateTime::<Utc>::from_utc(naivedatetime_utc, Utc);
///
/// let timezone_east = FixedOffset::east(8 * 60 * 60);
/// let naivedatetime_east = NaiveDate::from_ymd(2000, 1, 12).and_hms(10, 0, 0);
/// let datetime_east = DateTime::<FixedOffset>::from_local(naivedatetime_east, timezone_east);
///
/// let timezone_west = FixedOffset::west(7 * 60 * 60);
/// let naivedatetime_west = NaiveDate::from_ymd(2000, 1, 11).and_hms(19, 0, 0);
/// let datetime_west = DateTime::<FixedOffset>::from_local(naivedatetime_west, timezone_west);
/// assert_eq!(datetime_east, datetime_utc.with_timezone(&timezone_east));
/// assert_eq!(datetime_west, datetime_utc.with_timezone(&timezone_west));
/// ```
#[inline]
pub fn from_local(datetime: NaiveDateTime, offset: Tz::Offset) ->DateTime<Tz> {
let datetime_utc = datetime - offset.fix();
DateTime { datetime: datetime_utc, offset: offset }
}
/// Retrieves a date component
///
/// Unless you are immediately planning on turning this into a `DateTime`
@ -2842,4 +2869,24 @@ mod tests {
assert_eq!(format!("{} ", ymd_formatted), format!("{:<17}", ymd));
assert_eq!(format!(" {} ", ymd_formatted), format!("{:^17}", ymd));
}
#[test]
fn test_datetime_from_local() {
// 2000-01-12T02:00:00Z
let naivedatetime_utc = NaiveDate::from_ymd(2000, 1, 12).and_hms(2, 0, 0);
let datetime_utc = DateTime::<Utc>::from_utc(naivedatetime_utc, Utc);
// 2000-01-12T10:00:00+8:00:00
let timezone_east = FixedOffset::east(8 * 60 * 60);
let naivedatetime_east = NaiveDate::from_ymd(2000, 1, 12).and_hms(10, 0, 0);
let datetime_east = DateTime::<FixedOffset>::from_local(naivedatetime_east, timezone_east);
// 2000-01-11T19:00:00-7:00:00
let timezone_west = FixedOffset::west(7 * 60 * 60);
let naivedatetime_west = NaiveDate::from_ymd(2000, 1, 11).and_hms(19, 0, 0);
let datetime_west = DateTime::<FixedOffset>::from_local(naivedatetime_west, timezone_west);
assert_eq!(datetime_east, datetime_utc.with_timezone(&timezone_east));
assert_eq!(datetime_west, datetime_utc.with_timezone(&timezone_west));
}
}