Some references prior to 1967 refer to this zone as Central Alaska Standard Time (CAT) or as Alaska Standard Time (AST). The United States Standard Alaska Time was designated as UTC−10:00. The Standard Time Act of 1918 authorized the Interstate Commerce Commission to define each time zone. Two time zones have been referred to as the "Alaska Time Zone": a zone based on UTC−10:00 that covered much of Central Alaska in the early 20th century, and a zone based on UTC−09:00 zone that has covered all of the state except the Aleutian Islands since 1983. As such, Alaska spends most of the year on daylight saving time rather than standard time. The Anchorage Metropolitan Area is the largest metropolitan area in the zone.Įffective from 2007, the local time changes from AKST to AKDT at 02:00 LST (local standard time) to 03:00 LDT (local daylight time) on the second Sunday in March and returns at 02:00 LDT to 01:00 LST on the first Sunday in November. The largest city in the Alaskan Time Zone is Anchorage, Alaska. The western Aleutian Islands observe Hawaii–Aleutian Time, one hour behind the remainder of the state. daylight saving time: Alaska Daylight Time (AKDT).standard time: Alaska Standard Time (AKST).state of Alaska and is one hour behind the Pacific Time Zone. The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory. ![]() During daylight saving time its time offset is eight hours ( UTC−08:00). The Alaska Time Zone observes standard time by subtracting nine hours from Coordinated Universal Time ( UTC−09:00). Alaska Time ZoneĭST is observed throughout this time zone. This article is about the time zone with daylight change in North America.
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