What is GMT in HST?
Hawaii Standard Time is 10 hours behind
Greenwich Mean Time is on UTC+0:00 and Hawaii Standard Time is on UTC−10:00 right now. That gap holds all year, because both zones change their clocks together.
- Time in Greenwich
- 1:35 am
- Time in Honolulu
- 3:35 pm
- Difference
- −10 h
- Next clock change
- Neither zone
Convert a time
HST — Hawaii Standard Time
3:00 pm
Tue, the previous day
Daylight saving
Greenwich Mean Time
Greenwich Mean Time stays on GMT all year, so its offset from UTC never moves.
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
GMT to HST conversion table
Every hour of Wednesday, September 23, 2026, converted from Greenwich Mean Time to Hawaii Standard Time. 10 of the 24 hours fall on a different calendar day in Honolulu, which is marked.
- 12:00 am GMT
- 2:00 pm HST−1 day
- 1:00 am GMT
- 3:00 pm HST−1 day
- 2:00 am GMT
- 4:00 pm HST−1 day
- 3:00 am GMT
- 5:00 pm HST−1 day
- 4:00 am GMT
- 6:00 pm HST−1 day
- 5:00 am GMT
- 7:00 pm HST−1 day
- 6:00 am GMT
- 8:00 pm HST−1 day
- 7:00 am GMT
- 9:00 pm HST−1 day
- 8:00 am GMT
- 10:00 pm HST−1 day
- 9:00 am GMT
- 11:00 pm HST−1 day
- 10:00 am GMT
- 12:00 am HST
- 11:00 am GMT
- 1:00 am HST
- 12:00 pm GMT
- 2:00 am HST
- 1:00 pm GMT
- 3:00 am HST
- 2:00 pm GMT
- 4:00 am HST
- 3:00 pm GMT
- 5:00 am HST
- 4:00 pm GMT
- 6:00 am HST
- 5:00 pm GMT
- 7:00 am HST
- 6:00 pm GMT
- 8:00 am HST
- 7:00 pm GMT
- 9:00 am HST
- 8:00 pm GMT
- 10:00 am HST
- 9:00 pm GMT
- 11:00 am HST
- 10:00 pm GMT
- 12:00 pm HST
- 11:00 pm GMT
- 1:00 pm HST
Scheduling between the two
There is no overlap between a nine-to-six working day in Greenwich and one in Honolulu — the gap is too wide. A call has to sit early or late for one side. Early morning in Greenwich is the usual compromise, since that is late afternoon or evening in Honolulu.
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.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving