HAST (Hawaii-Aleutian Standard Time) is one of the well-known names of UTC-10 time zone which is 10h. behind of UTC (Coordinated Universal Time).The time offset from UTC can be written as -10:00.
It's used during the winter. During the summer HADT - Hawaii-Aleutian Daylight Time (UTC-9) is in use.
Some locations use HAST all year long.
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