What is the difference between HAST and UTC?
HAST is 10 hours behind UTC year-round, as it does not observe daylight saving time.
UTC time
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HAST
Hawaii-Aleutian Standard Time
3 Dec 2025
Frequently Asked Questions
Does this area observe DST?
No, Hawaii and the Aleutian Islands do not observe daylight saving time.
Which major cities follow this pattern?
Honolulu in Hawaii and parts of the Aleutian Islands in Alaska follow this schedule.
What areas share the same hours?
Some parts of the Aleutian Islands and other Pacific regions share this schedule.
How does this compare with UTC?
HAST is 10 hours behind UTC and remains consistent throughout the year.
Why doesn't this area observe DST year-round?
The regions do not observe daylight saving time due to their tropical and subarctic climates, where there is little variation in daylight hours across the year.
How did this system get established?
HAST was established to maintain consistency in the scheduling of business and government activities across Hawaii and the Aleutian Islands.
What are the typical work hours here?
Work hours are generally from 8:00 AM to 4:00 PM, with variations based on industry.
What is the economic importance of this area?
Hawaii plays a significant role in tourism, military presence, and agriculture, while the Aleutian Islands are important for fisheries and military operations.