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The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST)[1][2] by subtracting ten hours from Coordinated Universal Time (UTC−10:00). The clock time in this zone is based on the mean solar time of the 150th meridian west of the Greenwich Observatory.
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (June 2012) |
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.
During daylight saving time (DST), the Alaskan portion observes Hawaii–Aleutian Daylight Time (HDT, UTC−09:00), while Hawaii stays on standard time. Hawaii has not observed daylight saving time since September 1945.[3]
Until 1947, UTC−10:30 was used as standard time in Hawaii. On June 8 of that year, a new territorial law moved Hawaiian Standard Time 30 minutes ahead.[4]
Hawaii–Aleutian Standard Time[5] was established to maintain consistency in the scheduling of business and government activities across Hawaii and the Aleutian Islands.
French Polynesia uses UTC−10:00 for its major cities.[6] The Cook Islands also use the same time.[7] These areas do not use DST. "Hawaii–Aleutian Time Zone" is a U.S. term and for that reason the Polynesian areas are not considered to be a part of the Hawaii–Aleutian Time Zone.
The largest city and metropolitan area in the Hawaii–Aleutian Time Zone are Honolulu and its metropolitan area, respectively.
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