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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 .
For example, Sitka, the capital of Alaska at the time, at longitude 135°20′W, had a local time equivalent to UTC+14:59 under Russia and UTC−09:01 under the United States. [ 7 ] In 1900, "Alaska Standard Time" was established within the state as UTC−09:00 .
Alaska Time Zone (UTC−09:00; Zone V), which comprises most of the state of Alaska. Hawaii–Aleutian Time Zone (no daylight saving in Hawaii, UTC−10:00; zone W), which includes Hawaii and most of the length of the Aleutian Islands chain (west of 169°30′W).
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 ...
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory. The zone takes its name from the two areas it includes: Hawaii and the portion of Alaska's Aleutian Islands west of 169° 30 ′ W longitude.
The main purpose of this page is to list the current standard time offsets of different countries, territories and regions. Information on daylight saving time or historical changes in offsets can be found in the individual offset articles (e.g. UTC+01:00 ) or the country-specific time articles (e.g. Time in Russia ).
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.