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Add std::convert::From conversion between different DateTime offsets #271

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merged 5 commits into from
Apr 8, 2019
Merged

Add std::convert::From conversion between different DateTime offsets #271

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855d5f2
Add initial implementation of std::convert::From for DateTime offsets
mqudsi Aug 12, 2018
7f4d0da
Add doc ccomments for conversions between `DateTime` flavors
mqudsi Sep 5, 2018
973c603
Add basic conversion test
mqudsi Sep 6, 2018
ad6872c
Predicate `Local` conversion fns on `clock` feature
mqudsi Apr 8, 2019
43447e5
Update Changelog to mention `std::convert::From` conversions
mqudsi Apr 8, 2019
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37 changes: 37 additions & 0 deletions src/datetime.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -235,6 +235,43 @@ impl<Tz: TimeZone> DateTime<Tz> {
}
}

impl From<DateTime<Utc>> for DateTime<FixedOffset> {
fn from(src: DateTime<Utc>) -> Self {
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src.with_timezone(&FixedOffset::east(0))
}
}

impl From<DateTime<Utc>> for DateTime<Local> {
fn from(src: DateTime<Utc>) -> Self {
src.with_timezone(&Local)
}
}

impl From<DateTime<FixedOffset>> for DateTime<Utc> {
fn from(src: DateTime<FixedOffset>) -> Self {
src.with_timezone(&Utc)
}
}

impl From<DateTime<FixedOffset>> for DateTime<Local> {
fn from(src: DateTime<FixedOffset>) -> Self {
src.with_timezone(&Local)
}
}

impl From<DateTime<Local>> for DateTime<Utc> {
fn from(src: DateTime<Local>) -> Self {
src.with_timezone(&Utc)
}
}

impl From<DateTime<Local>> for DateTime<FixedOffset> {
fn from(src: DateTime<Local>) -> Self {
// todo: return in actual current local offset Tz
src.with_timezone(&FixedOffset::east(0))
}
}

/// Maps the local datetime to other datetime with given conversion function.
fn map_local<Tz: TimeZone, F>(dt: &DateTime<Tz>, mut f: F) -> Option<DateTime<Tz>>
where F: FnMut(NaiveDateTime) -> Option<NaiveDateTime> {
Expand Down