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Struct time::Date

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pub struct Date { /* private fields */ }
Expand description

Date in the proleptic Gregorian calendar.

By default, years between ±9999 inclusive are representable. This can be expanded to ±999,999 inclusive by enabling the large-dates crate feature. Doing so has performance implications and introduces some ambiguities when parsing.

Implementations

The minimum valid Date.

The value of this may vary depending on the feature flags enabled.

The maximum valid Date.

The value of this may vary depending on the feature flags enabled.

Attempt to create a Date from the year, month, and day.

assert!(Date::from_calendar_date(2019, Month::January, 1).is_ok());
assert!(Date::from_calendar_date(2019, Month::December, 31).is_ok());
Run
assert!(Date::from_calendar_date(2019, Month::February, 29).is_err()); // 2019 isn't a leap year.
Run

Attempt to create a Date from the year and ordinal day number.

assert!(Date::from_ordinal_date(2019, 1).is_ok());
assert!(Date::from_ordinal_date(2019, 365).is_ok());
Run
assert!(Date::from_ordinal_date(2019, 366).is_err()); // 2019 isn't a leap year.
Run

Attempt to create a Date from the ISO year, week, and weekday.

assert!(Date::from_iso_week_date(2019, 1, Monday).is_ok());
assert!(Date::from_iso_week_date(2019, 1, Tuesday).is_ok());
assert!(Date::from_iso_week_date(2020, 53, Friday).is_ok());
Run
assert!(Date::from_iso_week_date(2019, 53, Monday).is_err()); // 2019 doesn't have 53 weeks.
Run

Create a Date from the Julian day.

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

assert_eq!(Date::from_julian_day(0), Ok(date!(-4713 - 11 - 24)));
assert_eq!(Date::from_julian_day(2_451_545), Ok(date!(2000 - 01 - 01)));
assert_eq!(Date::from_julian_day(2_458_485), Ok(date!(2019 - 01 - 01)));
assert_eq!(Date::from_julian_day(2_458_849), Ok(date!(2019 - 12 - 31)));
Run

Get the year of the date.

assert_eq!(date!(2019 - 01 - 01).year(), 2019);
assert_eq!(date!(2019 - 12 - 31).year(), 2019);
assert_eq!(date!(2020 - 01 - 01).year(), 2020);
Run

Get the month.

assert_eq!(date!(2019 - 01 - 01).month(), Month::January);
assert_eq!(date!(2019 - 12 - 31).month(), Month::December);
Run

Get the day of the month.

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

assert_eq!(date!(2019 - 01 - 01).day(), 1);
assert_eq!(date!(2019 - 12 - 31).day(), 31);
Run

Get the day of the year.

The returned value will always be in the range 1..=366 (1..=365 for common years).

assert_eq!(date!(2019 - 01 - 01).ordinal(), 1);
assert_eq!(date!(2019 - 12 - 31).ordinal(), 365);
Run

Get the ISO week number.

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

assert_eq!(date!(2019 - 01 - 01).iso_week(), 1);
assert_eq!(date!(2019 - 10 - 04).iso_week(), 40);
assert_eq!(date!(2020 - 01 - 01).iso_week(), 1);
assert_eq!(date!(2020 - 12 - 31).iso_week(), 53);
assert_eq!(date!(2021 - 01 - 01).iso_week(), 53);
Run

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!(date!(2019 - 01 - 01).sunday_based_week(), 0);
assert_eq!(date!(2020 - 01 - 01).sunday_based_week(), 0);
assert_eq!(date!(2020 - 12 - 31).sunday_based_week(), 52);
assert_eq!(date!(2021 - 01 - 01).sunday_based_week(), 0);
Run

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!(date!(2019 - 01 - 01).monday_based_week(), 0);
assert_eq!(date!(2020 - 01 - 01).monday_based_week(), 0);
assert_eq!(date!(2020 - 12 - 31).monday_based_week(), 52);
assert_eq!(date!(2021 - 01 - 01).monday_based_week(), 0);
Run

Get the year, month, and day.

assert_eq!(
    date!(2019 - 01 - 01).to_calendar_date(),
    (2019, Month::January, 1)
);
Run

Get the year and ordinal day number.

assert_eq!(date!(2019 - 01 - 01).to_ordinal_date(), (2019, 1));
Run

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

assert_eq!(date!(2019 - 01 - 01).to_iso_week_date(), (2019, 1, Tuesday));
assert_eq!(date!(2019 - 10 - 04).to_iso_week_date(), (2019, 40, Friday));
assert_eq!(
    date!(2020 - 01 - 01).to_iso_week_date(),
    (2020, 1, Wednesday)
);
assert_eq!(
    date!(2020 - 12 - 31).to_iso_week_date(),
    (2020, 53, Thursday)
);
assert_eq!(date!(2021 - 01 - 01).to_iso_week_date(), (2020, 53, Friday));
Run

Get the weekday.

assert_eq!(date!(2019 - 01 - 01).weekday(), Tuesday);
assert_eq!(date!(2019 - 02 - 01).weekday(), Friday);
assert_eq!(date!(2019 - 03 - 01).weekday(), Friday);
assert_eq!(date!(2019 - 04 - 01).weekday(), Monday);
assert_eq!(date!(2019 - 05 - 01).weekday(), Wednesday);
assert_eq!(date!(2019 - 06 - 01).weekday(), Saturday);
assert_eq!(date!(2019 - 07 - 01).weekday(), Monday);
assert_eq!(date!(2019 - 08 - 01).weekday(), Thursday);
assert_eq!(date!(2019 - 09 - 01).weekday(), Sunday);
assert_eq!(date!(2019 - 10 - 01).weekday(), Tuesday);
assert_eq!(date!(2019 - 11 - 01).weekday(), Friday);
assert_eq!(date!(2019 - 12 - 01).weekday(), Sunday);
Run

Get the next calendar date.

assert_eq!(
    date!(2019 - 01 - 01).next_day(),
    Some(date!(2019 - 01 - 02))
);
assert_eq!(
    date!(2019 - 01 - 31).next_day(),
    Some(date!(2019 - 02 - 01))
);
assert_eq!(
    date!(2019 - 12 - 31).next_day(),
    Some(date!(2020 - 01 - 01))
);
assert_eq!(Date::MAX.next_day(), None);
Run

Get the previous calendar date.

assert_eq!(
    date!(2019 - 01 - 02).previous_day(),
    Some(date!(2019 - 01 - 01))
);
assert_eq!(
    date!(2019 - 02 - 01).previous_day(),
    Some(date!(2019 - 01 - 31))
);
assert_eq!(
    date!(2020 - 01 - 01).previous_day(),
    Some(date!(2019 - 12 - 31))
);
assert_eq!(Date::MIN.previous_day(), None);
Run

Get the Julian day for the date.

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

assert_eq!(date!(-4713 - 11 - 24).to_julian_day(), 0);
assert_eq!(date!(2000 - 01 - 01).to_julian_day(), 2_451_545);
assert_eq!(date!(2019 - 01 - 01).to_julian_day(), 2_458_485);
assert_eq!(date!(2019 - 12 - 31).to_julian_day(), 2_458_849);
Run

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

assert_eq!(Date::MAX.checked_add(1.days()), None);
assert_eq!(Date::MIN.checked_add((-2).days()), None);
assert_eq!(
    date!(2020 - 12 - 31).checked_add(2.days()),
    Some(date!(2021 - 01 - 02))
);
Run
Note

This function only takes whole days into account.

assert_eq!(Date::MAX.checked_add(23.hours()), Some(Date::MAX));
assert_eq!(Date::MIN.checked_add((-23).hours()), Some(Date::MIN));
assert_eq!(
    date!(2020 - 12 - 31).checked_add(23.hours()),
    Some(date!(2020 - 12 - 31))
);
assert_eq!(
    date!(2020 - 12 - 31).checked_add(47.hours()),
    Some(date!(2021 - 01 - 01))
);
Run

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

assert_eq!(Date::MAX.checked_sub((-2).days()), None);
assert_eq!(Date::MIN.checked_sub(1.days()), None);
assert_eq!(
    date!(2020 - 12 - 31).checked_sub(2.days()),
    Some(date!(2020 - 12 - 29))
);
Run
Note

This function only takes whole days into account.

assert_eq!(Date::MAX.checked_sub((-23).hours()), Some(Date::MAX));
assert_eq!(Date::MIN.checked_sub(23.hours()), Some(Date::MIN));
assert_eq!(
    date!(2020 - 12 - 31).checked_sub(23.hours()),
    Some(date!(2020 - 12 - 31))
);
assert_eq!(
    date!(2020 - 12 - 31).checked_sub(47.hours()),
    Some(date!(2020 - 12 - 30))
);
Run

Computes self + duration, saturating value on overflow.

assert_eq!(Date::MAX.saturating_add(1.days()), Date::MAX);
assert_eq!(Date::MIN.saturating_add((-2).days()), Date::MIN);
assert_eq!(
    date!(2020 - 12 - 31).saturating_add(2.days()),
    date!(2021 - 01 - 02)
);
Run
Note

This function only takes whole days into account.

assert_eq!(
    date!(2020 - 12 - 31).saturating_add(23.hours()),
    date!(2020 - 12 - 31)
);
assert_eq!(
    date!(2020 - 12 - 31).saturating_add(47.hours()),
    date!(2021 - 01 - 01)
);
Run

Computes self - duration, saturating value on overflow.

assert_eq!(Date::MAX.saturating_sub((-2).days()), Date::MAX);
assert_eq!(Date::MIN.saturating_sub(1.days()), Date::MIN);
assert_eq!(
    date!(2020 - 12 - 31).saturating_sub(2.days()),
    date!(2020 - 12 - 29)
);
Run
Note

This function only takes whole days into account.

assert_eq!(
    date!(2020 - 12 - 31).saturating_sub(23.hours()),
    date!(2020 - 12 - 31)
);
assert_eq!(
    date!(2020 - 12 - 31).saturating_sub(47.hours()),
    date!(2020 - 12 - 30)
);
Run

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

assert_eq!(
    date!(2022 - 02 - 18).replace_year(2019),
    Ok(date!(2019 - 02 - 18))
);
assert!(date!(2022 - 02 - 18).replace_year(-1_000_000_000).is_err()); // -1_000_000_000 isn't a valid year
assert!(date!(2022 - 02 - 18).replace_year(1_000_000_000).is_err()); // 1_000_000_000 isn't a valid year
Run

Replace the month of the year.

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

Replace the day of the month.

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

Methods to add a Time component, resulting in a PrimitiveDateTime.

Create a PrimitiveDateTime using the existing date. The Time component will be set to midnight.

assert_eq!(date!(1970-01-01).midnight(), datetime!(1970-01-01 0:00));
Run

Create a PrimitiveDateTime using the existing date and the provided Time.

assert_eq!(
    date!(1970-01-01).with_time(time!(0:00)),
    datetime!(1970-01-01 0:00),
);
Run

Attempt to create a PrimitiveDateTime using the existing date and the provided time.

assert!(date!(1970 - 01 - 01).with_hms(0, 0, 0).is_ok());
assert!(date!(1970 - 01 - 01).with_hms(24, 0, 0).is_err());
Run

Attempt to create a PrimitiveDateTime using the existing date and the provided time.

assert!(date!(1970 - 01 - 01).with_hms_milli(0, 0, 0, 0).is_ok());
assert!(date!(1970 - 01 - 01).with_hms_milli(24, 0, 0, 0).is_err());
Run

Attempt to create a PrimitiveDateTime using the existing date and the provided time.

assert!(date!(1970 - 01 - 01).with_hms_micro(0, 0, 0, 0).is_ok());
assert!(date!(1970 - 01 - 01).with_hms_micro(24, 0, 0, 0).is_err());
Run

Attempt to create a PrimitiveDateTime using the existing date and the provided time.

assert!(date!(1970 - 01 - 01).with_hms_nano(0, 0, 0, 0).is_ok());
assert!(date!(1970 - 01 - 01).with_hms_nano(24, 0, 0, 0).is_err());
Run

Format the Date using the provided format description.

Format the Date using the provided format description.

let format = format_description::parse("[year]-[month]-[day]")?;
assert_eq!(date!(2020 - 01 - 02).format(&format)?, "2020-01-02");
Run

Trait Implementations

The resulting type after applying the + operator.

Performs the + operation. Read more

The resulting type after applying the + operator.

Performs the + operation. Read more

Performs the += operation. Read more

Performs the += operation. Read more

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

This method returns an Ordering between self and other. Read more

Compares and returns the maximum of two values. Read more

Compares and returns the minimum of two values. Read more

Restrict a value to a certain interval. Read more

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

The resulting type after applying the - operator.

Performs the - operation. Read more

The resulting type after applying the - operator.

Performs the - operation. Read more

The resulting type after applying the - operator.

Performs the - operation. Read more

Performs the -= operation. Read more

Performs the -= operation. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.