The Hawaii-Aleutian Time Zone observes Hawaii-Aleutian Standard Time (HAST), by subtracting ten hours from Coordinated Universal Time (UTC-10). 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 Alaskan portion observes DST while Hawaii does not.
Hawaii used a standard time of GMT-10:30 from 1900 until 1947, when clocks were changed to the present -10:00 zone. [1]
| Time zones in North America | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Time Zone | UTC-10 | UTC-9 | UTC-8 | UTC-7 | UTC-6 | UTC-5 | UTC-4 | UTC-3:30 | UTC-3 | UTC-2:30 | UTC-2 |
| Name | Hawaii-Aleutian Standard | Alaska Standard | Pacific Standard | Mountain Standard | Central Standard | Eastern Standard | Atlantic Standard | Newfoundland Standard | Saint Pierre and Miquelon Standard | ||
| Hawaii-Aleutian Daylight | Alaska Daylight | Pacific Daylight | Mountain Daylight | Central Daylight | Eastern Daylight | Atlantic Daylight | Newfoundland Daylight | Saint Pierre and Miquelon Daylight | |||
]] The Hawaii-Aleutian Time Zone observes Hawaii-Aleutian Standard Time (HAST), by subtracting ten hours from Coordinated Universal Time (UTC-10). 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 Alaskan portion observes DST while Hawaii does not.
Hawaii used a standard time of GMT-10:30 from 1900 until 1947, when clocks were changed to the present -10:00 zone. [1]
French Polynesia uses this time zone for its major cities. The Cook Islands and Tokelau does also. These areas do not use DST.
| Time zones in North America | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours from UTC | Standard time | Daylight savings | |||||||||
| –10 | Hawaii-Aleutian | ||||||||||
| –9 | Alaska | Hawaii-Aleutian | |||||||||
| –8 | Pacific | Alaska | |||||||||
| –7 | Mountain | Pacific | |||||||||
| –6 | Central | Mountain | |||||||||
| –5 | Eastern | Central | |||||||||
| –4 | Atlantic | Eastern | |||||||||
| –3:30 | Newfoundland | ||||||||||
| –3 | Saint Pierre and Miquelon | Atlantic | |||||||||
| –2:30 | Newfoundland | ||||||||||
| –2 | Saint Pierre and Miquelon | ||||||||||
| See also: Time in Canada • Time in Mexico • Time in the United States | |||||||||||
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