Struct icu::timezone::ZoneOffsetCalculator

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

ZoneOffsetCalculator uses data from the data provider to calculate time zone offsets.

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impl ZoneOffsetCalculator

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pub const fn new() -> ZoneOffsetCalculator

Constructs a ZoneOffsetCalculator using compiled data.

Enabled with the compiled_data Cargo feature.

📚 Help choosing a constructor

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pub fn try_new_with_any_provider( provider: &(impl AnyProvider + ?Sized), ) -> Result<ZoneOffsetCalculator, DataError>

A version of [Self :: new] that uses custom data provided by an AnyProvider.

📚 Help choosing a constructor

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pub fn try_new_with_buffer_provider( provider: &(impl BufferProvider + ?Sized), ) -> Result<ZoneOffsetCalculator, DataError>

A version of [Self :: new] that uses custom data provided by a BufferProvider.

Enabled with the serde feature.

📚 Help choosing a constructor

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pub fn try_new_unstable( provider: &(impl DataProvider<ZoneOffsetPeriodV1Marker> + ?Sized), ) -> Result<ZoneOffsetCalculator, DataError>

A version of Self::new that uses custom data provided by a DataProvider.

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⚠️ The bounds on provider may change over time, including in SemVer minor releases.
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pub fn compute_offsets_from_time_zone( &self, time_zone_id: TimeZoneBcp47Id, _: (Date<Iso>, Time), ) -> Option<ZoneOffsets>

Calculate zone offsets from timezone and local datetime.

§Examples
use icu::calendar::{Date, Time};
use icu::timezone::TimeZoneBcp47Id;
use icu::timezone::ZoneOffsetCalculator;
use icu::timezone::UtcOffset;
use tinystr::tinystr;

let zoc = ZoneOffsetCalculator::new();

// America/Denver observes DST
let offsets = zoc.compute_offsets_from_time_zone(
    TimeZoneBcp47Id(tinystr!(8, "usden")),
    (Date::try_new_iso(2024, 1, 1).unwrap(), Time::midnight()),
).unwrap();
assert_eq!(offsets.standard, UtcOffset::try_from_seconds(-7 * 3600).unwrap());
assert_eq!(offsets.daylight, Some(UtcOffset::try_from_seconds(-6 * 3600).unwrap()));

// America/Phoenix does not
let offsets = zoc.compute_offsets_from_time_zone(
    TimeZoneBcp47Id(tinystr!(8, "usphx")),
    (Date::try_new_iso(2024, 1, 1).unwrap(), Time::midnight()),
).unwrap();
assert_eq!(offsets.standard, UtcOffset::try_from_seconds(-7 * 3600).unwrap());
assert_eq!(offsets.daylight, None);

Trait Implementations§

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impl Debug for ZoneOffsetCalculator

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for ZoneOffsetCalculator

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fn default() -> ZoneOffsetCalculator

Returns the “default value” for a type. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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where T: ?Sized,

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fn borrow(&self) -> &T

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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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fn into(self) -> U

Calls U::from(self).

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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where F: FnOnce(&Self) -> bool,

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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