HST to AHDT Converter
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
2:00 am02:00 HST (UTC-10), Oct 24, 2026 = 3:00 am03:00 AHDT (UTC-9), Oct 24, 2026
HST is 1 hour behind AHDT.
HST and AHDT examples
These examples always use HST (UTC-10) and AHDT (UTC-9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
HST is 1 hour behind AHDT.
How the time difference changes
HST is 1 hour behind AHDT year-round.
Working hours of 9:00 am to 6:00 pm in HST correspond to 10:00 am to 7:00 pm in AHDT.Working hours of 09:00 to 18:00 in HST correspond to 10:00 to 19:00 in AHDT.
Compare HST time with AHDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Hawaii Standard Time is 1 hour behind Alaska-Hawaii Daylight Time.
2:00 am02:00 in HST is 3:00 am03:00 in AHDT
HST to AHDT call time
Best time for a conference call or a meeting is between 9am-5pm09:00-17:00 in HST which corresponds to 10am-6pm10:00-18:00 in AHDT
2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours
3:00 am03:00 Alaska-Hawaii Daylight Time (AHDT). Offset UTC -9:00 hours
2:00 am02:00 HST / 3:00 am03:00 AHDT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| HST | AHDT |
|---|---|
| 1:00am | |
| 2:00am | |
| 3:00am | |
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| 6:00am | |
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| 9:00am | |
| 10:00am | |
| 11:00am | |
| 12:00pm | |
| 1:00pm | |
| 2:00pm | |
| 3:00pm | |
| 4:00pm | |
| 5:00pm | |
| 6:00pm | |
| 7:00pm | |
| 8:00pm | |
| 9:00pm | |
| 10:00pm | |
| 11:00pm | |
| 12:00am next day | |
| 01:00 | |
| 02:00 | |
| 03:00 | |
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| 05:00 | |
| 06:00 | |
| 07:00 | |
| 08:00 | |
| 09:00 | |
| 10:00 | |
| 11:00 | |
| 12:00 | |
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| 18:00 | |
| 19:00 | |
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| 21:00 | |
| 22:00 | |
| 23:00 | |
| 00:00 next day |
Hawaii Standard Time
Offset: HST is 10 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Principal Cities: The largest city in the HST time zone is Honolulu in the United States, with about 350,964 people. Other major cities in this time zone include Pearl City, Hilo, Kailua, Waipahu.
Daylight Saving: Some places on Hawaii Standard Time (HST) keep the same time all year, while others use HST for only part of the year and change their clocks for daylight saving time; see upcoming clock changes worldwide.
Today the lighter areas are on UTC−9 (HDT).
HST representations, usage and related time zones
- -10 - basic short
- -1000 - basic
- -10:00 - extended
- -1000 - sign character (-) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the west of the zero meridian.
- Whiskey - Military abbreviation for HST
- W - short form of 'Whiskey'
- America/Adak
- America/Atka
- HST
- Pacific/Honolulu
- Pacific/Johnston
- US/Aleutian
- US/Hawaii
- HAST - Hawaii-Aleutian Standard Time
- CKT - Cook Island Time
- HST - Hawaii Standard Time
- TAHT - Tahiti Time
- W - Whiskey Time Zone
Alaska-Hawaii Daylight Time
Offset: AHDT is 9 hours behind Greenwich Mean Time (GMT).
AHDT representations, usage and related time zones
- -09 - basic short
- -0900 - basic
- -09:00 - extended
- -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.
- Victor - Military abbreviation for AHDT
- V - short form of 'Victor'
- 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