Convert HDT Timezone
Convert Hawaii-Aleutian Daylight Time (HDT) to and from any other time zone.
Convert HDT to any other time zone and back. HDT is Hawaii-Aleutian Daylight Time, which runs at UTC-09:00.
The clock below starts on HDT. Add the cities you care about to read the matching local time straight across, and set a date and time to check a moment in the past or future.
- General Working Hours
- General Non-Working Hours
- Sleeping Hours & Public Holidays
- * Indicates Daylight Saving Time is in effect.
For more converters, browse our full list of time zone converters.
HDT covers 3 IANA time zones, including America/Adak, America/Atka, US/Aleutian. Daylight saving is applied automatically for whichever zone a city actually uses, so the result stays correct across the changeover.
The daylight saving time for the Aleutian Islands west of -169.5° longitude. Hawaii itself does not observe daylight saving time. HDT is one hour ahead of Hawaii-Aleutian Standard Time (HST). Active from March to November.
See the HDT time zone overview for the full picture, or the full time zone converter to compare any cities you like.