North American time zones:

HAST – Hawaii-Aleutian Standard Time

Time zone offset: UTC - 10 hours

Note that some places observe daylight saving time/summer time during summer, and are therefore using HADT instead in the summer. See below for details.

Time zone abbreviations: HAST, HST

Email time zone indicator: -1000

An email sent from someone in the HAST time zone will have the time zone listed as "-1000" in the headers of the email. (However, "-1000" does not have to be in HAST, as other time zones could have the same UTC offset).

Where and when is HAST observed?

HAST is used during winter in this US state (HADT during summer)

• Alaska - Aleutian Islands west of 169.30 West (east of 169.30 West use AKST/AKDT)

HAST is used all year in this US state

• Hawaii

Example locations in HAST

• Honolulu - all year
• Adak - during winter

Other time zones in North America

• NST - Newfoundland Standard Time
• NDT - Newfoundland Daylight Time
• AST - Atlantic Standard Time
• ADT - Atlantic Daylight Time
• EST - Eastern Standard Time
• EDT - Eastern Daylight Time
• CST - Central Standard Time
• CDT - Central Daylight Time
• MST - Mountain Standard Time
• MDT - Mountain Daylight Time
• PST - Pacific Standard Time
• PDT - Pacific Daylight Time
• AKST - Alaska Standard Time
• AKDT - Alaska Daylight Time
• HADT - Hawaii-Aleutian Daylight Time

Time zones in other regions

• Australia
• Europe
• Military

Related links

• Time zone abbreviations world-wide
• The World Clock - Time Zones - current time around the world
• The World Clock - Time Zone Converter - Convert between time zones
• World Clock - North America - current time in North America