Struct icu_timezone::MetazoneCalculator

pub struct MetazoneCalculator {
    pub(crate) metazone_period: DataPayload<MetazonePeriodV1Marker>,
}

MetazoneCalculator uses data from the data provider to calculate metazone id.

Fields

metazone_period: DataPayload<MetazonePeriodV1Marker>

Implementations

impl MetazoneCalculator

pub const fn new() -> Self

Constructs a MetazoneCalculator using compiled data.

✨ Enabled with the compiled_data Cargo feature.

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

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

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pub fn try_new_unstable( provider: &(impl DataProvider<MetazonePeriodV1Marker> + ?Sized), ) -> Result<Self, TimeZoneError>

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.

pub fn compute_metazone_from_time_zone( &self, time_zone_id: TimeZoneBcp47Id, local_datetime: &DateTime<Iso>, ) -> Option<MetazoneId>

Calculate metazone id from timezone id and local datetime.

Examples

use icu::calendar::DateTime;
use icu::timezone::provider::{MetazoneId, TimeZoneBcp47Id};
use icu::timezone::MetazoneCalculator;
use tinystr::tinystr;

let mzc = MetazoneCalculator::new();

assert_eq!(
    mzc.compute_metazone_from_time_zone(
        TimeZoneBcp47Id(tinystr!(8, "gugum")),
        &DateTime::try_new_iso_datetime(1969, 1, 1, 0, 0, 0).unwrap()
    ),
    None
);

assert_eq!(
    mzc.compute_metazone_from_time_zone(
        TimeZoneBcp47Id(tinystr!(8, "gugum")),
        &DateTime::try_new_iso_datetime(1970, 1, 1, 0, 0, 0).unwrap()
    ),
    Some(MetazoneId(tinystr!(4, "guam")))
);

assert_eq!(
    mzc.compute_metazone_from_time_zone(
        TimeZoneBcp47Id(tinystr!(8, "gugum")),
        &DateTime::try_new_iso_datetime(1975, 1, 1, 0, 0, 0).unwrap()
    ),
    Some(MetazoneId(tinystr!(4, "guam")))
);

assert_eq!(
    mzc.compute_metazone_from_time_zone(
        TimeZoneBcp47Id(tinystr!(8, "gugum")),
        &DateTime::try_new_iso_datetime(2000, 12, 22, 15, 0, 0).unwrap()
    ),
    Some(MetazoneId(tinystr!(4, "cham")))
);

Trait Implementations

impl Debug for MetazoneCalculator

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

Formats the value using the given formatter.

impl Default for MetazoneCalculator

fn default() -> Self

Returns the “default value” for a type.