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North American time zones:

HADT – Hawaii-Aleutian Daylight Time

Important

HADT is not observed in any location this year.

Locations that used to be on HADT for part or all of the year are now on HAST (Hawaii-Aleutian Standard Time) instead.

Currently no cities are observing HADT

Find local time and time zone for a location

We recommend looking up by location name, not time zone name.

Time zone offset: UTC - 9 hours

HADT is 9 hours behind of Coordinated Universal Time (UTC)

Note that HADT is a daylight saving time/summer time zone. It is generally only used during the summer in the places listed below, during the winter HAST is used instead

Time zone abbreviation: HADT

Full name is Hawaii-Aleutian Daylight Time

Email time zone indicator: -0900

An email sent from someone in the 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 HADT, as other time zones could have the same UTC offset).

For actual dates DST might be observed, look at the examples below

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Where and when is HADT observed?

US states using HADT in the summer and HAST during the winter

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

Time zone maps are under development and will be available later

Example location in HADT

Adak - This time zone offset is used during summer in this location

Other time zones in North America

Go directly through the links below, or see the North America time zone list

ADT - Atlantic Daylight Time
AKDT - Alaska Daylight Time
AKST - Alaska Standard Time
AST - Atlantic Standard Time
CDT - Central Daylight Time
CST - Central Standard Time
EDT - Eastern Daylight Time
EGST - Eastern Greenland Summer Time
EGT - East Greenland Time
EST - Eastern Standard Time
HAST - Hawaii-Aleutian Standard Time
MDT - Mountain Daylight Time
MST - Mountain Standard Time
NDT - Newfoundland Daylight Time
NST - Newfoundland Standard Time
PDT - Pacific Daylight Time
PMDT - Pierre & Miquelon Daylight Time
PMST - Pierre & Miquelon Standard Time
PST - Pacific Standard Time
WGST - Western Greenland Summer Time
WGT - West Greenland Time