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Make UNIX_EPOCH an associated constant of SystemTime #49501

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Merged
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Mar 31, 2018
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Make UNIX_EPOCH an associated constant of SystemTime #49501

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dfde231
Make UNIX_EPOCH an associated constant of SystemTime
sfackler Mar 30, 2018
df2e238
Fix doctest
sfackler Mar 30, 2018
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22 changes: 22 additions & 0 deletions src/libstd/time.rs
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Expand Up @@ -259,6 +259,28 @@ impl fmt::Debug for Instant {
}

impl SystemTime {
/// An anchor in time which can be used to create new `SystemTime` instances or
/// learn about where in time a `SystemTime` lies.
///
/// This constant is defined to be "1970-01-01 00:00:00 UTC" on all systems with
/// respect to the system clock. Using `duration_since` on an existing
/// `SystemTime` instance can tell how far away from this point in time a
/// measurement lies, and using `UNIX_EPOCH + duration` can be used to create a
/// `SystemTime` instance to represent another fixed point in time.
///
/// # Examples
///
/// ```no_run
/// use std::time::SystemTime;
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Just add #![feature(assoc_unix_epoch)] above this.

///
/// match SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
/// Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
/// Err(_) => panic!("SystemTime before UNIX EPOCH!"),
/// }
/// ```
#[unstable(feature = "assoc_unix_epoch", issue = "49502")]
pub const UNIX_EPOCH: SystemTime = UNIX_EPOCH;

/// Returns the system time corresponding to "now".
///
/// # Examples
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