Home > Time Zones > Abbreviations > HADT – Hawaii-Aleutian Daylight Time

HADT – Hawaii-Aleutian Daylight Time (Daylight Saving Time)

Also known as: HDT – Hawaii Daylight Time

HADT is currently not used at all

North America: HADT is currently not observed because locations are on standard time and are observing HAST.

Time zone map of HADT
No locations currently on HADT.
Observes HADT part of the year.
Areas with same time currently (UTC -9:00).
No locations are currently on HADT – Hawaii-Aleutian Daylight Time.
Observes HADT – Hawaii-Aleutian Daylight Time part of the year, but not currently.
Currently has same time zone offset as HADT (UTC -9:00) but different time zone name.

Hawaii-Aleutian Daylight Time (HADT) is 9 hours behind Coordinated Universal Time (UTC). This time zone is a DST (daylight saving time) time zone and is used in: North America.

See full time zone map

Winter Time & DST

This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: HAST (Hawaii-Aleutian Standard Time).

Email time zone indicator: -0900

An email sent from someone in the Hawaii-Aleutian Daylight Time (HADT) time zone will have the time zone listed as "-0900" in the headers of the email. (However, "-0900" does not have to be in Hawaii-Aleutian Daylight Time, as other time zones could have the same UTC offset).

Where and when is HADT observed?

North America

U.S. states using HADT in the summer and HAST in the winter

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

Other time zones in UTC -9:00

Some time zones exist that have the same offset as HADT, but can be found under a different name:

No locations currently on HADT

Find current time and time zone by city


Example cities

U.S.A. – Adak (Summer)

Related time zones

HAST – Hawaii-Aleutian Standard Time (Standard Time)

Time Zone Map with DST

Time zone map

Time Zone Map