73 lines
2.1 KiB
Rust
73 lines
2.1 KiB
Rust
// This is a part of Chrono.
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// See README.md and LICENSE.txt for details.
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//! The UTC (Coordinated Universal Time) time zone.
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use std::fmt;
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use oldtime;
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use naive::{NaiveDate, NaiveDateTime};
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use {Date, DateTime};
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use super::{TimeZone, Offset, LocalResult, FixedOffset};
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/// The UTC time zone. This is the most efficient time zone when you don't need the local time.
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/// It is also used as an offset (which is also a dummy type).
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///
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/// Using the [`TimeZone`](../../../chrono/offset/trait.TimeZone.html) methods
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/// on the UTC struct is the preferred way to construct `DateTime<UTC>`
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/// instances.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{DateTime, TimeZone, NaiveDateTime, UTC};
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///
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/// let dt = DateTime::<UTC>::from_utc(NaiveDateTime::from_timestamp(61, 0), UTC);
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///
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/// assert_eq!(UTC.timestamp(61, 0), dt);
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/// assert_eq!(UTC.ymd(1970, 1, 1).and_hms(0, 1, 1), dt);
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/// ~~~~
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct UTC;
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impl UTC {
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/// Returns a `Date` which corresponds to the current date.
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pub fn today() -> Date<UTC> { UTC::now().date() }
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/// Returns a `DateTime` which corresponds to the current date.
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pub fn now() -> DateTime<UTC> {
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let spec = oldtime::get_time();
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let naive = NaiveDateTime::from_timestamp(spec.sec, spec.nsec as u32);
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DateTime::from_utc(naive, UTC)
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}
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}
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impl TimeZone for UTC {
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type Offset = UTC;
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fn from_offset(_state: &UTC) -> UTC { UTC }
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fn offset_from_local_date(&self, _local: &NaiveDate) -> LocalResult<UTC> {
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LocalResult::Single(UTC)
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}
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fn offset_from_local_datetime(&self, _local: &NaiveDateTime) -> LocalResult<UTC> {
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LocalResult::Single(UTC)
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}
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fn offset_from_utc_date(&self, _utc: &NaiveDate) -> UTC { UTC }
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fn offset_from_utc_datetime(&self, _utc: &NaiveDateTime) -> UTC { UTC}
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}
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impl Offset for UTC {
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fn fix(&self) -> FixedOffset { FixedOffset::east(0) }
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}
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impl fmt::Debug for UTC {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "Z") }
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}
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impl fmt::Display for UTC {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "UTC") }
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}
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