What is the time difference between GMT and JST?

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

What are the best meeting times between GMT and JST?

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

GMT to JST Time Conversion

Greenwich Mean Time → Japan Standard Time

GMT

UTC+0

Greenwich Mean Time

offset

+9h

JST is 9h ahead

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 9 PM in JST. This offset may change during Daylight Saving Time.

Meeting planner tool Reverse: JST to GMT

All 24 Hours — GMT to JST

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 — 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.