Hawaii–Aleutian Time Zone
The Hawaii–Aleutian Time Zone observes Hawaii–Aleutian Standard Time (HST) 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.
| Hawaii–Aleutian Time Zone | |
|---|---|
| Time zone | |
| UTC offset | |
| HST | UTC−10:00 |
| HDT | UTC−09:00 |
| Current time | |
| 14:41, 15 February 2024 HST [refresh] | |
| Observance of DST | |
| DST is observed in some of this time zone. | |
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.
From 1900 until 1947, UTC−10:30 was used as standard time in Hawaii.
French Polynesia uses UTC−10:00 for its major cities. The Cook Islands also use the same time. 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.