HST to HADT Converter
Quick answers
Selected conversion
2:00 am02:00 HST (UTC-10), Oct 4, 2026 = 3:00 am03:00 HADT (UTC-9), Oct 4, 2026
HST is 1 hour behind HADT.
HST and HADT examples
These examples always use HST (UTC-10) and HADT (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 HADT.
How the time difference changes
For most of the year, HST is 1 hour behind HADT. At other times of the year, the HST and HADT converter rows show the same time.
For most of the year, working hours of 9:00 am to 5:00 pm in HST correspond to 10:00 am to 6:00 pm in HADT. At other times of the year, working hours of 9:00 am to 5:00 pm on the HST converter row correspond to 9:00 am to 5:00 pm on the HADT converter row.For most of the year, working hours of 09:00 to 17:00 in HST correspond to 10:00 to 18:00 in HADT. At other times of the year, working hours of 09:00 to 17:00 on the HST converter row correspond to 09:00 to 17:00 on the HADT converter row.
Compare HST time with HADT 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 Hawaii-Aleutian Daylight Time.
2:00 am02:00 in HST is 3:00 am03:00 in HADT
HST to HADT call time
Best time for a conference call or a meeting is between 9am-4pm09:00-16:00 in HST which corresponds to 10am-5pm10:00-17:00 in HADT
2:00 am02:00 Hawaii Standard Time (HST). Offset UTC -10:00 hours
3:00 am03:00 Hawaii-Aleutian Daylight Time (HADT). Offset UTC -9:00 hours
2:00 am02:00 HST / 3:00 am03:00 HADT
| HST | HADT |
|---|---|
| 12:00am | 1:00am |
| 1:00am | 2:00am |
| 2:00am | 3:00am |
| 3:00am | 4:00am |
| 4:00am | 5:00am |
| 5:00am | 6:00am |
| 6:00am | 7:00am |
| 7:00am | 8:00am |
| 8:00am | 9:00am |
| 9:00am | 10:00am |
| 10:00am | 11:00am |
| 11:00am | 12:00pm |
| 12:00pm | 1:00pm |
| 1:00pm | 2:00pm |
| 2:00pm | 3:00pm |
| 3:00pm | 4:00pm |
| 4:00pm | 5:00pm |
| 5:00pm | 6:00pm |
| 6:00pm | 7:00pm |
| 7:00pm | 8:00pm |
| 8:00pm | 9:00pm |
| 9:00pm | 10:00pm |
| 10:00pm | 11:00pm |
| 11:00pm | 12:00am |
| 00:00 | 01:00 |
| 01:00 | 02:00 |
| 02:00 | 03:00 |
| 03:00 | 04:00 |
| 04:00 | 05:00 |
| 05:00 | 06:00 |
| 06:00 | 07:00 |
| 07:00 | 08:00 |
| 08:00 | 09:00 |
| 09:00 | 10:00 |
| 10:00 | 11:00 |
| 11:00 | 12:00 |
| 12:00 | 13:00 |
| 13:00 | 14:00 |
| 14:00 | 15:00 |
| 15:00 | 16:00 |
| 16:00 | 17:00 |
| 17:00 | 18:00 |
| 18:00 | 19:00 |
| 19:00 | 20:00 |
| 20:00 | 21:00 |
| 21:00 | 22:00 |
| 22:00 | 23:00 |
| 23:00 | 00:00 |
Hawaii Standard Time
Offset: HST is 10 hours behind Greenwich Mean Time (GMT) and is used in Pacific
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: Clocks in Hawaii Standard Time (HST) do not change for daylight saving time, so HST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
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
Hawaii-Aleutian Daylight Time
Offset: HADT is 9 hours behind Greenwich Mean Time (GMT) and is used in North America
Daylight Saving: Hawaii-Aleutian Daylight Time (HADT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Hawaii-Aleutian Standard Time (HAST).
Start: Hawaii-Aleutian Daylight Time (HADT) started on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.
End: Hawaii-Aleutian Daylight Time (HADT) ends on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.
HADT 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 HADT
- 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