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This zone was renamed in 1983 [3] to Hawaii–Aleutian Standard Time when the majority of Alaska was moved out of the zone. Prior to 1983, the current Alaska Time Zone (UTC−09:00) was known as the Yukon Time Zone, observing Yukon Standard Time (YST).
Before time zones were introduced, every place used local observation of the sun to set its clocks, which meant that every location used a different local mean time based on its longitude. 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 ...
Current time; 20:39, 12 February 2025 UTC−08:00: Central meridian; ... United States (Alaska Time Zone) Alaska. Except Aleutian Islands west of 169.30°W [8]
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]
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.
The two extreme time zones on Earth (both in the mid-Pacific) differ by 26 hours. Standard Time Zones, as of January 2, 2024 In the following list, only the rightmost indent of a group of locations is meant to indicate the area observing the offset; the places above and to the left are meant solely to indicate the area's parent administrative ...
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 ...