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