HADT time now |
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02:32:31 Sat, 5 Jul 2025
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| UTC Offset: UTC -9 |
Hawaii-Aleutian Daylight Time (HADT) operates at UTC−9 hours and is used during daylight saving time in the western Aleutian Islands of Alaska, west of 169°30′ West longitude. Also referred to as "Hawaii-Aleutian Summer Time," HADT shifts one hour forward from Hawaii-Aleutian Standard Time (HAST, UTC−10) to make better use of daylight during the summer months.
Importance and Global Use of HADT
HADT is important for coordinating schedules, transportation, and community life in the Aleutian Islands, where remote communities, fisheries, and military operations depend on consistent and practical timekeeping. By advancing one hour during the summer, HADT provides more daylight in the evenings, improving work conditions and aligning with daylight saving practices elsewhere in Alaska.
Internationally, HADT helps synchronize the Aleutian Islands' seasonal time with flight schedules, maritime shipping, and communications across the Pacific. Its consistent rules and predictable transitions support smoother coordination with other regions, including mainland Alaska, the contiguous United States, and trans-Pacific partners.
Where and When HADT is used worldwide
Other Time Zones in UTC -9
Other time zones share the same offset as Hawaii-Aleutian Daylight Time (HADT), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.