Add timestamp_nanos generated method for TimeZone

This commit is contained in:
jean-airoldie 2019-03-06 10:32:40 -05:00
parent 77110ffecb
commit c92544923d
1 changed files with 43 additions and 0 deletions

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@ -381,6 +381,28 @@ pub trait TimeZone: Sized + Clone {
self.timestamp_opt(secs, millis as u32 * 1_000_000)
}
/// Makes a new `DateTime` from the number of non-leap nanoseconds
/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp").
///
/// Unlike [`timestamp_millis`](#method.timestamp_millis), this never
/// panics.
///
/// # Example
///
/// ~~~~
/// use chrono::{Utc, TimeZone};
///
/// assert_eq!(Utc.timestamp_nanos(1431648000000000).timestamp(), 1431648);
/// ~~~~
fn timestamp_nanos(&self, nanos: i64) -> DateTime<Self> {
let (mut secs, mut nanos) = (nanos / 1_000_000_000, nanos % 1_000_000_000);
if nanos < 0 {
secs -= 1;
nanos += 1_000_000_000;
}
self.timestamp_opt(secs, nanos as u32).unwrap()
}
/// Parses a string with the specified format string and
/// returns a `DateTime` with the current offset.
/// See the [`format::strftime` module](../format/strftime/index.html)
@ -466,4 +488,25 @@ mod tests {
let dt = Utc.timestamp_millis(-3600000);
assert_eq!(dt.to_string(), "1969-12-31 23:00:00 UTC");
}
#[test]
fn test_negative_nanos() {
let dt = Utc.timestamp_nanos(-1_000_000_000);
assert_eq!(dt.to_string(), "1969-12-31 23:59:59 UTC");
let dt = Utc.timestamp_nanos(-999_999_999);
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.000000001 UTC");
let dt = Utc.timestamp_nanos(-1);
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.999999999 UTC");
let dt = Utc.timestamp_nanos(-60_000_000_000);
assert_eq!(dt.to_string(), "1969-12-31 23:59:00 UTC");
let dt = Utc.timestamp_nanos(-3_600_000_000_000);
assert_eq!(dt.to_string(), "1969-12-31 23:00:00 UTC");
}
#[test]
fn test_nanos_never_panics() {
Utc.timestamp_nanos(i64::max_value());
Utc.timestamp_nanos(i64::default());
Utc.timestamp_nanos(i64::min_value());
}
}