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DateAlmanac

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 neither zone observes daylight saving.

Convert a time

GMT — Greenwich Mean Time

8:00 am

GMT, Sat, the next day

Time in Honolulu
10:29:43 PM
Time in Greenwich
8:29:43 AM
Difference
+10 h
Next clock change
Neither zone

Daylight saving

Hawaii Standard Time

No clock changes

Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.

Greenwich Mean Time

No clock changes

Greenwich Mean Time stays on GMT all year, so its offset from UTC never moves.

HST to GMT conversion table

Every hour of Friday, November 6, 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.

Other conversions