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The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time (UTC−09:00). During daylight saving time its time offset is eight hours ( UTC−08:00 ). The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory .
In 1900, "Alaska Standard Time" was established within the state as UTC−09:00. [ 8 ] In 1918, the United States Congress passed the Standard Time Act , which defined a standard time zone for Alaska - United States Standard Alaska Time, set at UTC−10:00 .
Time zone abbreviations for both Standard Time and Daylight Saving Time are shown exactly as they appear in the database. ... Alaska (most areas) Canonical −09:00 ...
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, ... Alaska Time Zone (UTC−09:00; ...
Congressional approval required for permanent daylight saving time, but not for permanent standard time. Hawaii and most of Arizona (everything except the Navajo Reservation) do not recognize ...
Alaska. Except Aleutian Islands west of 169.30°W [1] Hall Island (Alaska), at longitude 173°6′W, is the westernmost area of Alaska that observes UTC−09:00, but is far west of the theoretical zone limits (−142.5° to −127.5° longitude). Its position equates to a mean solar time of UTC−11:32.
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