What is HST in GMT?
Greenwich Mean Time is 10 hours ahead
Hawaii Standard Time is on UTC−10:00 and Greenwich Mean Time is on UTC+0:00 right now. That gap holds all year, because both zones change their clocks together.
- Time in Honolulu
- 4:56 pm
- Time in Greenwich
- 2:56 am
- Difference
- +10 h
- Next clock change
- Neither zone
Convert a time
GMT — Greenwich Mean Time
2:00 am
Wed, the next day
Daylight saving
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
Greenwich Mean Time
Greenwich Mean Time stays on GMT all year, so its offset from UTC never moves.
HST to GMT conversion table
Every hour of Tuesday, September 22, 2026, converted from Hawaii Standard Time to Greenwich Mean Time. 10 of the 24 hours fall on a different calendar day in Greenwich, which is marked.
- 12:00 am HST
- 10:00 am GMT
- 1:00 am HST
- 11:00 am GMT
- 2:00 am HST
- 12:00 pm GMT
- 3:00 am HST
- 1:00 pm GMT
- 4:00 am HST
- 2:00 pm GMT
- 5:00 am HST
- 3:00 pm GMT
- 6:00 am HST
- 4:00 pm GMT
- 7:00 am HST
- 5:00 pm GMT
- 8:00 am HST
- 6:00 pm GMT
- 9:00 am HST
- 7:00 pm GMT
- 10:00 am HST
- 8:00 pm GMT
- 11:00 am HST
- 9:00 pm GMT
- 12:00 pm HST
- 10:00 pm GMT
- 1:00 pm HST
- 11:00 pm GMT
- 2:00 pm HST
- 12:00 am GMT+1 day
- 3:00 pm HST
- 1:00 am GMT+1 day
- 4:00 pm HST
- 2:00 am GMT+1 day
- 5:00 pm HST
- 3:00 am GMT+1 day
- 6:00 pm HST
- 4:00 am GMT+1 day
- 7:00 pm HST
- 5:00 am GMT+1 day
- 8:00 pm HST
- 6:00 am GMT+1 day
- 9:00 pm HST
- 7:00 am GMT+1 day
- 10:00 pm HST
- 8:00 am GMT+1 day
- 11:00 pm HST
- 9:00 am GMT+1 day
Scheduling between the two
There is no overlap between a nine-to-six working day in Honolulu and one in Greenwich — the gap is too wide. A call has to sit early or late for one side. Early morning in Honolulu is the usual compromise, since that is late afternoon or evening in Greenwich.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving
Greenwich Mean Time (GMT) is used in as a fixed UTC+0 offset. Note that the UK itself leaves GMT every summer — see British Time below.