Convert Greenwich Mean Time to Japan Standard Time - Quick & Accurate
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Hover over any hour to see corresponding time in both zones
To schedule a meeting between GMT and JST:
Pro Tip: Schedule calls during the overlap window for optimal convenience for both time zones
| GMT Time | JST Time | Context |
|---|---|---|
| 12:00 AM | 09:00 AM | Midnight GMT |
| 01:00 AM | 10:00 AM | Late Night |
| 02:00 AM | 11:00 AM | Late Night |
| 03:00 AM | 12:00 PM | Late Night |
| 04:00 AM | 01:00 PM | Late Night |
| 05:00 AM | 02:00 PM | Late Night |
| 06:00 AM | 03:00 PM | Early Morning GMT |
| 07:00 AM | 04:00 PM | Night Time |
| 08:00 AM | 05:00 PM | Night Time |
| 09:00 AM | 06:00 PM | Work Starts GMT |
| 10:00 AM | 07:00 PM | Night Time |
| 11:00 AM | 08:00 PM | Night Time |
London
Europe/London
Tokyo
Asia/Tokyo
JST (Japan Standard Time) is 9 hours ahead of GMT (Greenwich Mean Time). This means when it's 12:00 PM in London (GMT), it's 9:00 PM in Tokyo (JST).
The best time to call from GMT to JST is during overlapping business hours. For GMT callers, schedule between 9:00 AM - 12:00 PM GMT to ensure both parties are within standard business hours.
The time difference may change during daylight saving transitions if one region observes DST while the other doesn't. Greenwich Mean Time (UTC+0 (GMT) / UTC+1 (BST)) and Japan Standard Time (UTC+9) may have different DST schedules.
GMT includes cities like London. JST includes cities like Tokyo. Both time zones cover important business and cultural centers.
In 2025, DST in North America starts on March 9 at 2:00 AM and ends on November 2 at 2:00 AM. Other regions may have different DST schedules or not observe DST at all.