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New world release date time zone5/20/2023 ![]() SimpleTimeZone: SimpleTimeZone is a concrete subclass of TimeZone that implements the standard time zones used today internationally.This API supports conversion between GMT and local time. TimeZone: TimeZone is an abstract base class that defines the time zone API.ICU supports time zones through two classes: In areas that do not observe daylight savings time, wall time is equivalent to standard time. In areas that observe daylight savings time for part of the year, wall time is either standard time or daylight savings time, depending on the date. Wall Time: Wall time is what a local clock on the wall reads.Daylight savings time is observed in most non-equatorial areas. In California, daylight savings time is GMT-7:00. This offset is typically one hour, but is sometimes less. Daylight Savings Time: Daylight savings time is local time with a daylight savings time offset.For example, in California, standard time is GMT-8:00 that is, 8 hours before GMT. Standard Time: Standard Time is local time without a daylight savings time offset.At this point it is useful to define three different flavors of local time: The offset differs in the summer because of daylight savings time, or DST. The offset -8:00 indicates that Pacific Time is obtained from GMT by adding -8:00, that is, by subtracting 8 hours. We use the two terms interchangeably in ICU since ICU does not concern itself with either leap seconds or historical behavior.) Using this system, Pacific Time is expressed as GMT-8:00, or GMT-7:00 in the summer. (This is similar, but not precisely identical, to Universal Coordinated Time, or UTC. Local time in Greenwich is referred to as Greenwich Mean Time, or GMT. ![]() To make things simple, instead of relating time zones to one another, all time zones are related to a common reference point.įor historical reasons, the reference point is Greenwich, England. For example, in the United States, Pacific Time is three hours earlier than Eastern Time when it’s 6 P.M. ICU4C TZ update when ICU data is built into a shared libraryĪ time zone is a system that is used for relating local times in different geographical areas to one another.ICU4C TZ update when ICU is configured for individual files.Factory Methods and the Default Timezone.This site uses Just the Docs, a documentation theme for Jekyll. Updating MeasureUnit with new CLDR data.
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