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DateAlmanac

What is JST in GMT?

Greenwich Mean Time is 9 hours behind

Japan Standard Time is on UTC+9:00 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

Time in Tokyo
5:29:23 PM
Time in Greenwich
8:29:23 AM
Difference
−9 h
Next clock change
Neither zone

Daylight saving

Japan Standard Time

No clock changes

Japan Standard Time stays on JST 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.

JST to GMT conversion table

Every hour of Saturday, November 7, 2026, converted from Japan Standard Time to Greenwich Mean Time. 9 of the 24 hours fall on a different calendar day in Greenwich, which is marked.

12:00 am JST
3:00 pm GMT−1 day
1:00 am JST
4:00 pm GMT−1 day
2:00 am JST
5:00 pm GMT−1 day
3:00 am JST
6:00 pm GMT−1 day
4:00 am JST
7:00 pm GMT−1 day
5:00 am JST
8:00 pm GMT−1 day
6:00 am JST
9:00 pm GMT−1 day
7:00 am JST
10:00 pm GMT−1 day
8:00 am JST
11:00 pm GMT−1 day
9:00 am JST
12:00 am GMT
10:00 am JST
1:00 am GMT
11:00 am JST
2:00 am GMT
12:00 pm JST
3:00 am GMT
1:00 pm JST
4:00 am GMT
2:00 pm JST
5:00 am GMT
3:00 pm JST
6:00 am GMT
4:00 pm JST
7:00 am GMT
5:00 pm JST
8:00 am GMT
6:00 pm JST
9:00 am GMT
7:00 pm JST
10:00 am GMT
8:00 pm JST
11:00 am GMT
9:00 pm JST
12:00 pm GMT
10:00 pm JST
1:00 pm GMT
11:00 pm JST
2:00 pm GMT

Scheduling between the two

There is no overlap between a nine-to-six working day in Tokyo and one in Greenwich — the gap is too wide. A call has to sit early or late for one side. Early morning in Tokyo is the usual compromise, since that is late afternoon or evening in Greenwich.

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