What is the time difference between JST and GMT?

JST is 9 hours behind GMT. JST is UTC+9 and GMT is UTC+0.

What are the best meeting times between JST and GMT?

Best overlap hours: 5 PM JST = 8 AM GMT; 6 PM JST = 9 AM GMT.

JST to GMT Time Conversion

Japan Standard Time → Greenwich Mean Time

JST

UTC+9

Japan Standard Time

offset

-9h

GMT is 9h behind

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 3 AM in GMT. This offset may change during Daylight Saving Time.

Meeting planner tool Reverse: GMT to JST

All 24 Hours — JST to GMT

Click any row to see the full detail page for that hour

Both business hoursPartial overlapOff hours

12 AM6 AM12 PM6 PM11 PM

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.