Hawaii–Aleutian Standard Time

Hawaii–Aleutian Standard Time (HAST) is ten hours behind Greenwich Mean Time and is observed throughout the year in the Hawaiian portion of the Hawaii–Aleutian Time Zone of North America, and other Pacific Islands.

In the Aleutian Islands of Alaska it is observed, but only for four months of the year. It begins on the first Sunday in November when clocks are moved back from 2:00 A.M. HADT to 1:00 A.M. HAST and ends on the second Sunday in March, when clocks are advanced from 2:00 A.M. HAST to 3:00 A.M. HADT.

French Polynesia and the Cook Islands are in the same time zone and also observe standard time all year round but these areas are located in the southern hemisphere where the seasons are opposite and thus do not follow North American DST policies.

...
Wikipedia