HADT (Hawaii-Aleutian Daylight Time) is one of the well-known names of UTC-9 time zone which is 9h. behind of UTC (Coordinated Universal Time).The time offset from UTC can be written as -09:00.
It's used as a DST (summer daylight saving time).During the winter, HAST - Hawaii-Aleutian Standard Time(UTC-10) is in use.
Some locations use HAST all year long.
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