Struct time::OffsetDateTime

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pub struct OffsetDateTime(/* private fields */);

Expand description

A PrimitiveDateTime with a UtcOffset.

All comparisons are performed using the UTC time.

Implementations§

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impl OffsetDateTime

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pub const UNIX_EPOCH: Self = _

Midnight, 1 January, 1970 (UTC).

assert_eq!(OffsetDateTime::UNIX_EPOCH, datetime!(1970-01-01 0:00 UTC),);

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pub fn now_utc() -> Self

Create a new OffsetDateTime with the current date and time in UTC.

assert!(OffsetDateTime::now_utc().year() >= 2019);
assert_eq!(OffsetDateTime::now_utc().offset(), offset!(UTC));

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pub fn now_local() -> Result<Self, IndeterminateOffset>

Attempt to create a new OffsetDateTime with the current date and time in the local offset. If the offset cannot be determined, an error is returned.

assert!(OffsetDateTime::now_local().is_ok());

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pub const fn to_offset(self, offset: UtcOffset) -> Self

Convert the OffsetDateTime from the current UtcOffset to the provided UtcOffset.

assert_eq!(
    datetime!(2000-01-01 0:00 UTC)
        .to_offset(offset!(-1))
        .year(),
    1999,
);

// Let's see what time Sydney's new year's celebration is in New York and Los Angeles.

// Construct midnight on new year's in Sydney.
let sydney = datetime!(2000-01-01 0:00 +11);
let new_york = sydney.to_offset(offset!(-5));
let los_angeles = sydney.to_offset(offset!(-8));
assert_eq!(sydney.hour(), 0);
assert_eq!(new_york.hour(), 8);
assert_eq!(los_angeles.hour(), 5);

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Panics

This method panics if the local date-time in the new offset is outside the supported range.

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pub const fn from_unix_timestamp(timestamp: i64) -> Result<Self, ComponentRange>

Create an OffsetDateTime from the provided Unix timestamp. Calling .offset() on the resulting value is guaranteed to return UTC.

assert_eq!(
    OffsetDateTime::from_unix_timestamp(0),
    Ok(OffsetDateTime::UNIX_EPOCH),
);
assert_eq!(
    OffsetDateTime::from_unix_timestamp(1_546_300_800),
    Ok(datetime!(2019-01-01 0:00 UTC)),
);

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If you have a timestamp-nanosecond pair, you can use something along the lines of the following:

let (timestamp, nanos) = (1, 500_000_000);
assert_eq!(
    OffsetDateTime::from_unix_timestamp(timestamp)? + Duration::nanoseconds(nanos),
    OffsetDateTime::UNIX_EPOCH + 1.5.seconds()
);

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pub const fn from_unix_timestamp_nanos( timestamp: i128 ) -> Result<Self, ComponentRange>

Construct an OffsetDateTime from the provided Unix timestamp (in nanoseconds). Calling .offset() on the resulting value is guaranteed to return UTC.

assert_eq!(
    OffsetDateTime::from_unix_timestamp_nanos(0),
    Ok(OffsetDateTime::UNIX_EPOCH),
);
assert_eq!(
    OffsetDateTime::from_unix_timestamp_nanos(1_546_300_800_000_000_000),
    Ok(datetime!(2019-01-01 0:00 UTC)),
);

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pub const fn offset(self) -> UtcOffset

Get the UtcOffset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).offset(), offset!(UTC));
assert_eq!(datetime!(2019-01-01 0:00 +1).offset(), offset!(+1));

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pub const fn unix_timestamp(self) -> i64

Get the Unix timestamp.

assert_eq!(datetime!(1970-01-01 0:00 UTC).unix_timestamp(), 0);
assert_eq!(datetime!(1970-01-01 0:00 -1).unix_timestamp(), 3_600);

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pub const fn unix_timestamp_nanos(self) -> i128

Get the Unix timestamp in nanoseconds.

use time_macros::datetime;
assert_eq!(datetime!(1970-01-01 0:00 UTC).unix_timestamp_nanos(), 0);
assert_eq!(
    datetime!(1970-01-01 0:00 -1).unix_timestamp_nanos(),
    3_600_000_000_000,
);

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pub const fn date(self) -> Date

Get the Date in the stored offset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).date(), date!(2019-01-01));
assert_eq!(
    datetime!(2019-01-01 0:00 UTC)
        .to_offset(offset!(-1))
        .date(),
    date!(2018-12-31),
);

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pub const fn time(self) -> Time

Get the Time in the stored offset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).time(), time!(0:00));
assert_eq!(
    datetime!(2019-01-01 0:00 UTC)
        .to_offset(offset!(-1))
        .time(),
    time!(23:00)
);

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pub const fn year(self) -> i32

Get the year of the date in the stored offset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).year(), 2019);
assert_eq!(
    datetime!(2019-12-31 23:00 UTC)
        .to_offset(offset!(+1))
        .year(),
    2020,
);
assert_eq!(datetime!(2020-01-01 0:00 UTC).year(), 2020);

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pub const fn month(self) -> Month

Get the month of the date in the stored offset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).month(), Month::January);
assert_eq!(
    datetime!(2019-12-31 23:00 UTC)
        .to_offset(offset!(+1))
        .month(),
    Month::January,
);

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pub const fn day(self) -> u8

Get the day of the date in the stored offset.

The returned value will always be in the range 1..=31.

assert_eq!(datetime!(2019-01-01 0:00 UTC).day(), 1);
assert_eq!(
    datetime!(2019-12-31 23:00 UTC)
        .to_offset(offset!(+1))
        .day(),
    1,
);

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pub const fn ordinal(self) -> u16

Get the day of the year of the date in the stored offset.

The returned value will always be in the range 1..=366.

assert_eq!(datetime!(2019-01-01 0:00 UTC).ordinal(), 1);
assert_eq!(
    datetime!(2019-12-31 23:00 UTC)
        .to_offset(offset!(+1))
        .ordinal(),
    1,
);

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pub const fn iso_week(self) -> u8

Get the ISO week number of the date in the stored offset.

The returned value will always be in the range 1..=53.

assert_eq!(datetime!(2019-01-01 0:00 UTC).iso_week(), 1);
assert_eq!(datetime!(2020-01-01 0:00 UTC).iso_week(), 1);
assert_eq!(datetime!(2020-12-31 0:00 UTC).iso_week(), 53);
assert_eq!(datetime!(2021-01-01 0:00 UTC).iso_week(), 53);

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pub const fn sunday_based_week(self) -> u8

Get the week number where week 1 begins on the first Sunday.

The returned value will always be in the range 0..=53.

assert_eq!(datetime!(2019-01-01 0:00 UTC).sunday_based_week(), 0);
assert_eq!(datetime!(2020-01-01 0:00 UTC).sunday_based_week(), 0);
assert_eq!(datetime!(2020-12-31 0:00 UTC).sunday_based_week(), 52);
assert_eq!(datetime!(2021-01-01 0:00 UTC).sunday_based_week(), 0);

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pub const fn monday_based_week(self) -> u8

Get the week number where week 1 begins on the first Monday.

The returned value will always be in the range 0..=53.

assert_eq!(datetime!(2019-01-01 0:00 UTC).monday_based_week(), 0);
assert_eq!(datetime!(2020-01-01 0:00 UTC).monday_based_week(), 0);
assert_eq!(datetime!(2020-12-31 0:00 UTC).monday_based_week(), 52);
assert_eq!(datetime!(2021-01-01 0:00 UTC).monday_based_week(), 0);

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pub const fn to_calendar_date(self) -> (i32, Month, u8)

Get the year, month, and day.

assert_eq!(
    datetime!(2019-01-01 0:00 UTC).to_calendar_date(),
    (2019, Month::January, 1)
);

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pub const fn to_ordinal_date(self) -> (i32, u16)

Get the year and ordinal day number.

assert_eq!(
    datetime!(2019-01-01 0:00 UTC).to_ordinal_date(),
    (2019, 1)
);

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pub const fn to_iso_week_date(self) -> (i32, u8, Weekday)

Get the ISO 8601 year, week number, and weekday.

assert_eq!(
    datetime!(2019-01-01 0:00 UTC).to_iso_week_date(),
    (2019, 1, Tuesday)
);
assert_eq!(
    datetime!(2019-10-04 0:00 UTC).to_iso_week_date(),
    (2019, 40, Friday)
);
assert_eq!(
    datetime!(2020-01-01 0:00 UTC).to_iso_week_date(),
    (2020, 1, Wednesday)
);
assert_eq!(
    datetime!(2020-12-31 0:00 UTC).to_iso_week_date(),
    (2020, 53, Thursday)
);
assert_eq!(
    datetime!(2021-01-01 0:00 UTC).to_iso_week_date(),
    (2020, 53, Friday)
);

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pub const fn weekday(self) -> Weekday

Get the weekday of the date in the stored offset.

assert_eq!(datetime!(2019-01-01 0:00 UTC).weekday(), Tuesday);
assert_eq!(datetime!(2019-02-01 0:00 UTC).weekday(), Friday);
assert_eq!(datetime!(2019-03-01 0:00 UTC).weekday(), Friday);

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pub const fn to_julian_day(self) -> i32

Get the Julian day for the date. The time is not taken into account for this calculation.

The algorithm to perform this conversion is derived from one provided by Peter Baum; it is freely available here.

assert_eq!(datetime!(-4713-11-24 0:00 UTC).to_julian_day(), 0);
assert_eq!(datetime!(2000-01-01 0:00 UTC).to_julian_day(), 2_451_545);
assert_eq!(datetime!(2019-01-01 0:00 UTC).to_julian_day(), 2_458_485);
assert_eq!(datetime!(2019-12-31 0:00 UTC).to_julian_day(), 2_458_849);

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pub const fn to_hms(self) -> (u8, u8, u8)

Get the clock hour, minute, and second.

assert_eq!(datetime!(2020-01-01 0:00:00 UTC).to_hms(), (0, 0, 0));
assert_eq!(datetime!(2020-01-01 23:59:59 UTC).to_hms(), (23, 59, 59));

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pub const fn to_hms_milli(self) -> (u8, u8, u8, u16)

Get the clock hour, minute, second, and millisecond.

assert_eq!(
    datetime!(2020-01-01 0:00:00 UTC).to_hms_milli(),
    (0, 0, 0, 0)
);
assert_eq!(
    datetime!(2020-01-01 23:59:59.999 UTC).to_hms_milli(),
    (23, 59, 59, 999)
);

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pub const fn to_hms_micro(self) -> (u8, u8, u8, u32)

Get the clock hour, minute, second, and microsecond.

assert_eq!(
    datetime!(2020-01-01 0:00:00 UTC).to_hms_micro(),
    (0, 0, 0, 0)
);
assert_eq!(
    datetime!(2020-01-01 23:59:59.999_999 UTC).to_hms_micro(),
    (23, 59, 59, 999_999)
);

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pub const fn to_hms_nano(self) -> (u8, u8, u8, u32)

Get the clock hour, minute, second, and nanosecond.

assert_eq!(
    datetime!(2020-01-01 0:00:00 UTC).to_hms_nano(),
    (0, 0, 0, 0)
);
assert_eq!(
    datetime!(2020-01-01 23:59:59.999_999_999 UTC).to_hms_nano(),
    (23, 59, 59, 999_999_999)
);

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pub const fn hour(self) -> u8

Get the clock hour in the stored offset.

The returned value will always be in the range 0..24.

assert_eq!(datetime!(2019-01-01 0:00 UTC).hour(), 0);
assert_eq!(
    datetime!(2019-01-01 23:59:59 UTC)
        .to_offset(offset!(-2))
        .hour(),
    21,
);

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pub const fn minute(self) -> u8

Get the minute within the hour in the stored offset.

The returned value will always be in the range 0..60.

assert_eq!(datetime!(2019-01-01 0:00 UTC).minute(), 0);
assert_eq!(
    datetime!(2019-01-01 23:59:59 UTC)
        .to_offset(offset!(+0:30))
        .minute(),
    29,
);

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pub const fn second(self) -> u8

Get the second within the minute in the stored offset.

The returned value will always be in the range 0..60.

assert_eq!(datetime!(2019-01-01 0:00 UTC).second(), 0);
assert_eq!(
    datetime!(2019-01-01 23:59:59 UTC)
        .to_offset(offset!(+0:00:30))
        .second(),
    29,
);

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pub const fn millisecond(self) -> u16

Get the milliseconds within the second in the stored offset.

The returned value will always be in the range 0..1_000.

assert_eq!(datetime!(2019-01-01 0:00 UTC).millisecond(), 0);
assert_eq!(datetime!(2019-01-01 23:59:59.999 UTC).millisecond(), 999);

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pub const fn microsecond(self) -> u32

Get the microseconds within the second in the stored offset.

The returned value will always be in the range 0..1_000_000.

assert_eq!(datetime!(2019-01-01 0:00 UTC).microsecond(), 0);
assert_eq!(
    datetime!(2019-01-01 23:59:59.999_999 UTC).microsecond(),
    999_999,
);

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pub const fn nanosecond(self) -> u32

Get the nanoseconds within the second in the stored offset.

The returned value will always be in the range 0..1_000_000_000.

assert_eq!(datetime!(2019-01-01 0:00 UTC).nanosecond(), 0);
assert_eq!(
    datetime!(2019-01-01 23:59:59.999_999_999 UTC).nanosecond(),
    999_999_999,
);

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pub const fn checked_add(self, duration: Duration) -> Option<Self>

Computes self + duration, returning None if an overflow occurred.

let datetime = Date::MIN.midnight().assume_offset(offset!(+10));
assert_eq!(datetime.checked_add((-2).days()), None);

let datetime = Date::MAX.midnight().assume_offset(offset!(+10));
assert_eq!(datetime.checked_add(2.days()), None);

assert_eq!(
    datetime!(2019 - 11 - 25 15:30 +10).checked_add(27.hours()),
    Some(datetime!(2019 - 11 - 26 18:30 +10))
);

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pub const fn checked_sub(self, duration: Duration) -> Option<Self>

Computes self - duration, returning None if an overflow occurred.

let datetime = Date::MIN.midnight().assume_offset(offset!(+10));
assert_eq!(datetime.checked_sub(2.days()), None);

let datetime = Date::MAX.midnight().assume_offset(offset!(+10));
assert_eq!(datetime.checked_sub((-2).days()), None);

assert_eq!(
    datetime!(2019 - 11 - 25 15:30 +10).checked_sub(27.hours()),
    Some(datetime!(2019 - 11 - 24 12:30 +10))
);

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pub const fn saturating_add(self, duration: Duration) -> Self

Computes self + duration, saturating value on overflow.

assert_eq!(
    datetime!(-9999-01-01 0:00 +10).saturating_add((-2).days()),
    datetime!(-9999-01-01 0:00 +10)
);

assert_eq!(
    datetime!(+9999-12-31 23:59:59.999_999_999 +10).saturating_add(2.days()),
    datetime!(+9999-12-31 23:59:59.999_999_999 +10)
);

assert_eq!(
    datetime!(2019 - 11 - 25 15:30 +10).saturating_add(27.hours()),
    datetime!(2019 - 11 - 26 18:30 +10)
);

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pub const fn saturating_sub(self, duration: Duration) -> Self

Computes self - duration, saturating value on overflow.

assert_eq!(
    datetime!(-9999-01-01 0:00 +10).saturating_sub(2.days()),
    datetime!(-9999-01-01 0:00 +10)
);

assert_eq!(
    datetime!(+9999-12-31 23:59:59.999_999_999 +10).saturating_sub((-2).days()),
    datetime!(+9999-12-31 23:59:59.999_999_999 +10)
);

assert_eq!(
    datetime!(2019 - 11 - 25 15:30 +10).saturating_sub(27.hours()),
    datetime!(2019 - 11 - 24 12:30 +10)
);

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impl OffsetDateTime

Methods that replace part of the OffsetDateTime.

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pub const fn replace_time(self, time: Time) -> Self

Replace the time, which is assumed to be in the stored offset. The date and offset components are unchanged.

assert_eq!(
    datetime!(2020-01-01 5:00 UTC).replace_time(time!(12:00)),
    datetime!(2020-01-01 12:00 UTC)
);
assert_eq!(
    datetime!(2020-01-01 12:00 -5).replace_time(time!(7:00)),
    datetime!(2020-01-01 7:00 -5)
);
assert_eq!(
    datetime!(2020-01-01 0:00 +1).replace_time(time!(12:00)),
    datetime!(2020-01-01 12:00 +1)
);

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pub const fn replace_date(self, date: Date) -> Self

Replace the date, which is assumed to be in the stored offset. The time and offset components are unchanged.

assert_eq!(
    datetime!(2020-01-01 12:00 UTC).replace_date(date!(2020-01-30)),
    datetime!(2020-01-30 12:00 UTC)
);
assert_eq!(
    datetime!(2020-01-01 0:00 +1).replace_date(date!(2020-01-30)),
    datetime!(2020-01-30 0:00 +1)
);

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pub const fn replace_date_time(self, date_time: PrimitiveDateTime) -> Self

Replace the date and time, which are assumed to be in the stored offset. The offset component remains unchanged.

assert_eq!(
    datetime!(2020-01-01 12:00 UTC).replace_date_time(datetime!(2020-01-30 16:00)),
    datetime!(2020-01-30 16:00 UTC)
);
assert_eq!(
    datetime!(2020-01-01 12:00 +1).replace_date_time(datetime!(2020-01-30 0:00)),
    datetime!(2020-01-30 0:00 +1)
);

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pub const fn replace_offset(self, offset: UtcOffset) -> Self

Replace the offset. The date and time components remain unchanged.

assert_eq!(
    datetime!(2020-01-01 0:00 UTC).replace_offset(offset!(-5)),
    datetime!(2020-01-01 0:00 -5)
);

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pub const fn replace_year(self, year: i32) -> Result<Self, ComponentRange>

Replace the year. The month and day will be unchanged.

assert_eq!(
    datetime!(2022 - 02 - 18 12:00 +01).replace_year(2019),
    Ok(datetime!(2019 - 02 - 18 12:00 +01))
);
assert!(datetime!(2022 - 02 - 18 12:00 +01).replace_year(-1_000_000_000).is_err()); // -1_000_000_000 isn't a valid year
assert!(datetime!(2022 - 02 - 18 12:00 +01).replace_year(1_000_000_000).is_err()); // 1_000_000_000 isn't a valid year

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pub const fn replace_month(self, month: Month) -> Result<Self, ComponentRange>

Replace the month of the year.

assert_eq!(
    datetime!(2022 - 02 - 18 12:00 +01).replace_month(Month::January),
    Ok(datetime!(2022 - 01 - 18 12:00 +01))
);
assert!(datetime!(2022 - 01 - 30 12:00 +01).replace_month(Month::February).is_err()); // 30 isn't a valid day in February

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pub const fn replace_day(self, day: u8) -> Result<Self, ComponentRange>

Replace the day of the month.

assert_eq!(
    datetime!(2022 - 02 - 18 12:00 +01).replace_day(1),
    Ok(datetime!(2022 - 02 - 01 12:00 +01))
);
assert!(datetime!(2022 - 02 - 18 12:00 +01).replace_day(0).is_err()); // 00 isn't a valid day
assert!(datetime!(2022 - 02 - 18 12:00 +01).replace_day(30).is_err()); // 30 isn't a valid day in February

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pub const fn replace_hour(self, hour: u8) -> Result<Self, ComponentRange>

Replace the clock hour.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_hour(7),
    Ok(datetime!(2022 - 02 - 18 07:02:03.004_005_006 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_hour(24).is_err()); // 24 isn't a valid hour

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pub const fn replace_minute(self, minute: u8) -> Result<Self, ComponentRange>

Replace the minutes within the hour.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_minute(7),
    Ok(datetime!(2022 - 02 - 18 01:07:03.004_005_006 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_minute(60).is_err()); // 60 isn't a valid minute

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pub const fn replace_second(self, second: u8) -> Result<Self, ComponentRange>

Replace the seconds within the minute.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_second(7),
    Ok(datetime!(2022 - 02 - 18 01:02:07.004_005_006 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_second(60).is_err()); // 60 isn't a valid second

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pub const fn replace_millisecond( self, millisecond: u16 ) -> Result<Self, ComponentRange>

Replace the milliseconds within the second.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_millisecond(7),
    Ok(datetime!(2022 - 02 - 18 01:02:03.007 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_millisecond(1_000).is_err()); // 1_000 isn't a valid millisecond

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pub const fn replace_microsecond( self, microsecond: u32 ) -> Result<Self, ComponentRange>

Replace the microseconds within the second.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_microsecond(7_008),
    Ok(datetime!(2022 - 02 - 18 01:02:03.007_008 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_microsecond(1_000_000).is_err()); // 1_000_000 isn't a valid microsecond

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pub const fn replace_nanosecond( self, nanosecond: u32 ) -> Result<Self, ComponentRange>

Replace the nanoseconds within the second.

assert_eq!(
    datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_nanosecond(7_008_009),
    Ok(datetime!(2022 - 02 - 18 01:02:03.007_008_009 +01))
);
assert!(datetime!(2022 - 02 - 18 01:02:03.004_005_006 +01).replace_nanosecond(1_000_000_000).is_err()); // 1_000_000_000 isn't a valid nanosecond

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impl OffsetDateTime

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pub fn format_into( self, output: &mut impl Write, format: &(impl Formattable + ?Sized) ) -> Result<usize, Format>

Format the OffsetDateTime using the provided format description.

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pub fn format( self, format: &(impl Formattable + ?Sized) ) -> Result<String, Format>

Format the OffsetDateTime using the provided format description.

let format = format_description::parse(
    "[year]-[month]-[day] [hour]:[minute]:[second] [offset_hour \
         sign:mandatory]:[offset_minute]:[offset_second]",
)?;
assert_eq!(
    datetime!(2020-01-02 03:04:05 +06:07:08).format(&format)?,
    "2020-01-02 03:04:05 +06:07:08"
);