JST
UTC+9
Japan Standard Time
GMT
UTC+0
Greenwich Mean Time
GMT observes DST — offset shifts ±1h during transitions
Japan Standard Time (JST) is 9 hours behind Greenwich Mean Time (GMT). When it is noon in JST, it is 4 AM in GMT. This offset may change during Daylight Saving Time transitions.
All 24 Hours — JST to GMT
Click any row to see the full detail page. Current hour in JST is highlighted.
Best Meeting Times — JST & GMT
Recommended windows where both JST and GMT participants are within working hours (8 AM–6 PM).
Tip: When scheduling between JST and GMT, aim for the “Best” windows above. These times keep both parties within normal working hours, avoiding early-morning or late-evening fatigue. Note that one of these time zones observes Daylight Saving Time — the offset may shift ±1 hour around transition dates.
Related Time Zone Conversions
Frequently Asked Questions — JST to GMT
Japan Standard Time (JST) is 9 hours behind Greenwich Mean Time (GMT). JST is UTC+9 and GMT is UTC+0. This offset may shift by ±1 hour during Daylight Saving Time transitions.
Live Now
JST
UTC+9
09:07:06
Wednesday
GMT
UTC+1
01:07:06
Wednesday
Right now, 9 AM JST = 1 AM GMT
Business Hours Quick Jump
Reverse Conversion
GMT to JST
Greenwich Mean Time → Japan Standard Time
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