Struct icu::datetime::fieldset::V

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#[non_exhaustive]
pub struct V { pub length: NeoSkeletonLength, }
Expand description

“Central Time” ⇒ time zone in generic non-location format

§Examples

 use icu::calendar::{Date, Time};
 use icu::timezone::{TimeZoneBcp47Id, TimeZoneInfo, UtcOffset, ZoneVariant};
 use icu::datetime::TimeFormatter;
use icu::datetime::fieldset::V;
 use icu::locale::locale;
 use tinystr::tinystr;
 use writeable::assert_try_writeable_eq;

let fmt = TimeFormatter::try_new(
     &locale!("en").into(),
    V::long(),
 )
 .unwrap();

 // Time zone info for America/Chicago in the summer
 let zone = TimeZoneBcp47Id(tinystr!(8, "uschi"))
     .with_offset("-05".parse().ok())
     .at_time((Date::try_new_iso(2022, 8, 29).unwrap(), Time::midnight()))
     .with_zone_variant(ZoneVariant::Daylight);

 assert_try_writeable_eq!(
     fmt.format(&zone),
    "Central Time"
 );

When a display name is unavailable, falls back to the location format:

use icu::calendar::{Date, Time};
use icu::timezone::{IxdtfParser, TimeZoneBcp47Id, TimeZoneInfo, UtcOffset, ZoneVariant};
use icu::calendar::Gregorian;
use icu::datetime::FixedCalendarDateTimeFormatter;
use icu::datetime::fieldset::V;
use icu::locale::locale;
use tinystr::tinystr;
use writeable::assert_try_writeable_eq;

// Time zone info for Europe/Istanbul
let zone = TimeZoneBcp47Id(tinystr!(8, "trist"))
    .without_offset()
    .at_time((Date::try_new_iso(2022, 1, 29).unwrap(), Time::midnight()));

let fmt = FixedCalendarDateTimeFormatter::<Gregorian, _>::try_new(
    &locale!("en").into(),
    V::short(),
)
.unwrap();

assert_try_writeable_eq!(
    fmt.format(&zone),
    "Türkiye Time"
);

Can also fall back to the UTC offset:

use icu::calendar::{Date, Time};
use icu::timezone::{TimeZoneInfo, UtcOffset, TimeZoneIdMapper, TimeZoneBcp47Id};
use icu::datetime::TimeFormatter;
use icu::datetime::fieldset::V;
use icu::datetime::DateTimeWriteError;
use icu::locale::locale;
use tinystr::tinystr;
use writeable::assert_try_writeable_eq;

// Set up the formatter
let mut tzf = TimeFormatter::try_new(
    &locale!("en").into(),
    V::short(),
)
.unwrap();

// "uschi" - has symbol data for short generic non-location
let time_zone = TimeZoneIdMapper::new()
    .iana_to_bcp47("America/Chicago")
    .with_offset("-05".parse().ok())
    .at_time((Date::try_new_iso(2022, 8, 29).unwrap(), Time::midnight()));
assert_try_writeable_eq!(
    tzf.format(&time_zone),
    "CT"
);

// "ushnl" - has time zone override symbol data for short generic non-location
let time_zone = TimeZoneIdMapper::new()
    .iana_to_bcp47("Pacific/Honolulu")
    .with_offset("-10".parse().ok())
    .at_time((Date::try_new_iso(2022, 8, 29).unwrap(), Time::midnight()));
assert_try_writeable_eq!(
    tzf.format(&time_zone),
    "HST"
);

// Mis-spelling of "America/Chicago" results in a fallback to offset format
let time_zone = TimeZoneIdMapper::new()
    .iana_to_bcp47("America/Chigagou")
    .with_offset("-05".parse().ok())
    .at_time((Date::try_new_iso(2022, 8, 29).unwrap(), Time::midnight()));
assert_try_writeable_eq!(
    tzf.format(&time_zone),
    "GMT-5"
);

Since non-location names might change over time, this time zone style requires a reference time.

use icu::calendar::{DateTime, Iso};
use icu::datetime::TimeFormatter;
use icu::datetime::fieldset::V;
use icu::timezone::{TimeZoneBcp47Id, UtcOffset};
use tinystr::tinystr;
use icu::locale::locale;
use writeable::assert_try_writeable_eq;

let time_zone_basic = TimeZoneBcp47Id(tinystr!(8, "uschi")).without_offset();

let formatter = TimeFormatter::try_new(
    &locale!("en-US").into(),
    V::medium(),
)
.unwrap();

// error[E0271]: type mismatch resolving `<Base as TimeZoneModel>::LocalTime == (Date<Iso>, Time)`
// note: required by a bound in `TimeFormatter::<C, FSet>::format`
formatter.format(&time_zone_basic);

Fields (Non-exhaustive)§

This struct is marked as non-exhaustive
Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.
§length: NeoSkeletonLength

The desired length of the formatted string.

See: NeoSkeletonLength

Implementations§

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impl V

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pub const fn with_length(length: NeoSkeletonLength) -> V

Creates a V skeleton with the given formatting length.

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pub const fn long() -> V

Creates a V skeleton with a long length.

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pub const fn medium() -> V

Creates a V skeleton with a medium length.

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pub const fn short() -> V

Creates a V skeleton with a short length.

Trait Implementations§

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impl Clone for V

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fn clone(&self) -> V

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl DateTimeMarkers for V

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type D = ()

Associated types for date formatting. Read more
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type T = ()

Associated types for time formatting. Read more
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type Z = V

Associated types for time zone formatting. Read more
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type GluePatternV1Marker = NeverMarker<GluePatternV1<'static>>

Marker for loading the date/time glue pattern.
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impl DateTimeNamesMarker for V

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impl Debug for V

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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 GetField<CompositeFieldSet> for V

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fn get_field(&self) -> CompositeFieldSet

Returns the value of this trait’s field T.
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impl PartialEq for V

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fn eq(&self, other: &V) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl ZoneMarkers for V

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type TimeZoneIdInput = TimeZoneBcp47Id

Marker for resolving the time zone id input field.
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type TimeZoneOffsetInput = Option<UtcOffset>

Marker for resolving the time zone offset input field.
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type TimeZoneVariantInput = ()

Marker for resolving the time zone variant input field.
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type TimeZoneLocalTimeInput = (Date<Iso>, Time)

Marker for resolving the time zone non-location display names, which depend on the datetime.
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type EssentialsV1Marker = TimeZoneEssentialsV1Marker

Marker for loading core time zone data.
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type LocationsV1Marker = LocationsV1Marker

Marker for loading location names for time zone formatting
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type GenericLongV1Marker = MetazoneGenericNamesLongV1Marker

Marker for loading generic long time zone names.
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type GenericShortV1Marker = MetazoneGenericNamesShortV1Marker

Marker for loading generic short time zone names.
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type SpecificLongV1Marker = NeverMarker<MetazoneSpecificNamesV1<'static>>

Marker for loading specific long time zone names.
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type SpecificShortV1Marker = NeverMarker<MetazoneSpecificNamesV1<'static>>

Marker for loading generic short time zone names.
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type MetazonePeriodV1Marker = MetazonePeriodV1Marker

Marker for loading metazone periods.
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impl Copy for V

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impl Eq for V

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impl StructuralPartialEq for V

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impl UnstableSealed for V

Auto Trait Implementations§

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impl Freeze for V

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impl RefUnwindSafe for V

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impl Send for V

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impl Sync for V

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impl Unpin for V

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impl UnwindSafe for V

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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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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impl<T> GetField<T> for T
where T: Copy,

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fn get_field(&self) -> T

Returns the value of this trait’s field T.
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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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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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,