GMT
UTC+0
Greenwich Mean Time
JST
UTC+9
Japan Standard Time
GMT observes DST — offset shifts ±1h during transitions
Greenwich Mean Time (GMT) is 9 hours ahead Japan Standard Time (JST). When it is noon in GMT, it is 8 PM in JST. This offset may change during Daylight Saving Time transitions.
All 24 Hours — GMT to JST
Click any row to see the full detail page. Current hour in GMT is highlighted.
Best Meeting Times — GMT & JST
Recommended windows where both GMT and JST participants are within working hours (8 AM–6 PM).
Tip: When scheduling between GMT and JST, 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 — GMT to JST
Greenwich Mean Time (GMT) is 9 hours ahead of Japan Standard Time (JST). GMT is UTC+0 and JST is UTC+9. This offset may shift by ±1 hour during Daylight Saving Time transitions.
Live Now
GMT
UTC+1
00:43:41
Wednesday
JST
UTC+9
08:43:41
Wednesday
Right now, 12 AM GMT = 8 AM JST
Business Hours Quick Jump
Reverse Conversion
JST to GMT
Japan Standard Time → Greenwich Mean Time
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