Home   Time Zones   Abbreviations   HDT – Hawaii-Aleutian Daylight Time

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

Also known as: HADT – Hawaii Daylight Time

North America: HADT is not observed in any location this year.

Please use the search field on the right to find the correct local time in any city.

Time zone map of HDT
No locations currently on HDT.
Areas with same time currently (UTC -9).
No locations are currently on HDT – Hawaii-Aleutian Daylight Time.
Currently has same time zone offset as HDT (UTC -9) but different time zone name.

Hawaii-Aleutian Daylight Time (HDT) is 9 hours behind Coordinated Universal Time (UTC). This time zone is a 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: HST (Hawaii Standard Time).

Email Time Zone Indicator: -0900

An email sent from someone in the Hawaii-Aleutian Daylight Time (HDT) 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 HDT Observed?

North America

U.S. states using HDT in the summer and HST 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

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


No locations currently on HDT


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Find current time and time zone by city


Example cities

USA – Adak (Summer)

Related time zones

HST – Hawaii Standard Time (Standard Time)


Time Zone Map with DST

Time zone map

Time Zone Map

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