HAST time now |
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01:51:14 Sat, 5 Jul 2025
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| UTC Offset: UTC -10 |
Hawaii-Aleutian Standard Time (HAST) operates at UTC−10 hours, used during standard time in the Aleutian Islands of Alaska west of 169°30′ West longitude. Sometimes referred to as "Hawaii-Aleutian Time," HAST aligns with Hawaii Standard Time (HST) in offset but differs by observing daylight saving time, switching to Hawaii-Aleutian Daylight Time (HADT, UTC−9) during the summer months.
Importance and Global Use of HAST
HAST is important for managing life, work, and transportation across the remote Aleutian Islands, which depend on reliable and practical timekeeping in challenging weather and seasonal light conditions. Its consistent UTC−10 offset during winter supports predictable scheduling for local communities, fishing fleets, and military operations.
On a broader scale, HAST helps the Aleutian Islands coordinate effectively with mainland Alaska, the continental United States, and Pacific neighbors. Its alignment with HST in Hawaii also helps integrate aviation, maritime routes, and communication systems across this strategically significant region.
Where and When HAST is used worldwide
Other Time Zones in UTC -10
Other time zones share the same offset as Hawaii-Aleutian Standard Time (HAST), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.