HAST/HADT

Hawaii-Aleutian Standard Time

GMT -10

12am

3am

6am

9am

12pm

3pm

6pm

9pm

HADT is not used on this date

This converter uses HAST (GMT -10), the offset Adak uses on this date.

Use this HADT Converter page to check current local time, UTC and GMT offset, daylight saving details, related time zones, and popular time converter links.

Hawaii-Aleutian Daylight Time

Offset: HADT is 9 hours behind Greenwich Mean Time (GMT) and is used in North America

Daylight Saving: Hawaii-Aleutian Daylight Time (HADT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Hawaii-Aleutian Standard Time (HAST).

End: Hawaii-Aleutian Daylight Time (HADT) ended on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am local standard time instead. Daylight saving ends annually on the first Sunday of November

Start: Hawaii-Aleutian Daylight Time (HADT) starts on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am. Daylight saving starts annually on the second Sunday of March

HADT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data

-09 - basic short
-0900 - basic
-09:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers

-0900 - sign character (-) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others

Victor - Military abbreviation for HADT
V - short form of 'Victor'

Time zones with the GMT -9 offset:

AKST - Alaska Standard Time
AHDT - Alaska-Hawaii Daylight Time
HADT - Hawaii-Aleutian Daylight Time
GAMT - Gambier Time
HDT - Hawaii Daylight Time
V - Victor Time Zone