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|Hawaii-Aleutian Time Zone|
|01:35, 21 January 2021 HAST|
|Observance of DST|
|DST is observed in some of this 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.
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 in the Hawaii-Aleutian Time Zone is Honolulu; the Honolulu Metropolitan Area is the largest metropolitan area in the zone.
Time zones §9.47. The following forms are to be used when abbreviating names of time zones: ... HDT--Hawaii-Aleutian daylight time (not observed in HI) ... HST--Hawaii-Aleutian standard time
Hawaii-Aleutian (HT); HST -10; HDT -9; DST observed in Aleutian Islands, but not Hawaii