Struct icu_datetime::fieldsets::V

#[non_exhaustive]
pub struct V {}

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

Examples

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

let fmt = TimeFormatter::try_new(
    locale!("en").into(),
   V::new(),
)
.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_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::fieldsets::Vs;
use icu::locale::locale;
use tinystr::tinystr;
use writeable::assert_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(),
    Vs::new(),
)
.unwrap();

assert_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::fieldsets::Vs;
use icu::datetime::DateTimeWriteError;
use icu::locale::locale;
use tinystr::tinystr;
use writeable::assert_writeable_eq;

// Set up the formatter
let mut tzf = TimeFormatter::try_new(
    locale!("en").into(),
    Vs::new(),
)
.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_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_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_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::fieldsets::V;
use icu::timezone::{TimeZoneBcp47Id, UtcOffset};
use tinystr::tinystr;
use icu::locale::locale;
use writeable::assert_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);

Implementations

impl V

pub const fn new() -> Self

Creates a new field set with default options.

Trait Implementations

impl Clone for V

fn clone(&self) -> V

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl DateTimeMarkers for V

type D = ()

Associated types for date formatting.

type T = ()

Associated types for time formatting.

type Z = V

Associated types for time zone formatting.

type GluePatternV1Marker = NeverMarker<GluePatternV1<'static>>

Marker for loading the date/time glue pattern.

impl DateTimeNamesMarker for V

type YearNames = ()

type MonthNames = ()

type WeekdayNames = ()

type DayPeriodNames = ()

type ZoneEssentials = TimeZoneEssentialsV1Marker

type ZoneLocations = LocationsV1Marker

type ZoneGenericLong = MetazoneGenericNamesLongV1Marker

type ZoneGenericShort = MetazoneGenericNamesShortV1Marker

type ZoneSpecificLong = ()

type ZoneSpecificShort = ()

type MetazoneLookup = MetazonePeriodV1Marker

impl Debug for V

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

Formats the value using the given formatter.

impl Default for V

fn default() -> Self

Returns the “default value” for a type.

impl GetField<CompositeFieldSet> for V

fn get_field(&self) -> CompositeFieldSet

Returns the value of this trait’s field T.

impl PartialEq for V

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

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

impl ZoneMarkers for V

type TimeZoneIdInput = TimeZoneBcp47Id

Marker for resolving the time zone id input field.

type TimeZoneOffsetInput = Option<UtcOffset>

Marker for resolving the time zone offset input field.

type TimeZoneVariantInput = ()

Marker for resolving the time zone variant input field.

type TimeZoneLocalTimeInput = (Date<Iso>, Time)

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

type EssentialsV1Marker = TimeZoneEssentialsV1Marker

Marker for loading core time zone data.

type LocationsV1Marker = LocationsV1Marker

Marker for loading location names for time zone formatting

type GenericLongV1Marker = MetazoneGenericNamesLongV1Marker

Marker for loading generic long time zone names.

type GenericShortV1Marker = MetazoneGenericNamesShortV1Marker

Marker for loading generic short time zone names.

type SpecificLongV1Marker = NeverMarker<MetazoneSpecificNamesV1<'static>>

Marker for loading specific long time zone names.

type SpecificShortV1Marker = NeverMarker<MetazoneSpecificNamesV1<'static>>

Marker for loading generic short time zone names.

type MetazonePeriodV1Marker = MetazonePeriodV1Marker

Marker for loading metazone periods.

impl Copy for V

impl Eq for V

impl StructuralPartialEq for V

impl UnstableSealed for V