[−][src]Trait chrono::DurationRound

pub trait DurationRound: Sized {
    type Err: Error;
    fn duration_round(self, duration: Duration) -> Result<Self, Self::Err>;

    fn duration_trunc(self, duration: Duration) -> Result<Self, Self::Err>;
}

Extension trait for rounding or truncating a DateTime by a Duration.

Limitations

Both rounding and truncating are done via [Duration::num_nanoseconds] and [DateTime::timestamp_nanos]. This means that they will fail if either the Duration or the DateTime are too big to represented as nanoseconds. They will also fail if the Duration is bigger than the timestamp.

Associated Types

type Err: Error

Error that can occur in rounding or truncating

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Required methods

fn duration_round(self, duration: Duration) -> Result<Self, Self::Err>

Return a copy rounded by Duration.

Example

let dt = Utc.ymd(2018, 1, 11).and_hms_milli(12, 0, 0, 154);
assert_eq!(
    dt.duration_round(Duration::milliseconds(10)).unwrap().to_string(),
    "2018-01-11 12:00:00.150 UTC"
);
assert_eq!(
    dt.duration_round(Duration::days(1)).unwrap().to_string(),
    "2018-01-12 00:00:00 UTC"
);

fn duration_trunc(self, duration: Duration) -> Result<Self, Self::Err>

Return a copy truncated by Duration.

Example

let dt = Utc.ymd(2018, 1, 11).and_hms_milli(12, 0, 0, 154);
assert_eq!(
    dt.duration_trunc(Duration::milliseconds(10)).unwrap().to_string(),
    "2018-01-11 12:00:00.150 UTC"
);
assert_eq!(
    dt.duration_trunc(Duration::days(1)).unwrap().to_string(),
    "2018-01-11 00:00:00 UTC"
);
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Implementors

impl<Tz: TimeZone> DurationRound for DateTime<Tz>[src]

type Err = RoundingError

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