Convert GMT to JST
Greenwich Mean Time (GMT) to Japan Standard Time (JST)
UK-Japan business relationships span finance (London-Tokyo stock exchanges), automotive (Toyota, Nissan UK operations), and tech partnerships. The 9-hour gap during GMT means very little overlap in standard business hours. BST narrows it to 8 hours, opening a slim but useful afternoon-morning window.
When it's 12:00 PM GMT, it's 9:00 PM JST
Interactive Converter
Pick any time and date to convert between GMT and JST.
GMT to JST Conversion Table
Full 24-hour comparison. Business hours (9 AM -- 6 PM) are highlighted.
| GMT | JST |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM +1 day |
| 4:00 PM | 1:00 AM +1 day |
| 5:00 PM | 2:00 AM +1 day |
| 6:00 PM | 3:00 AM +1 day |
| 7:00 PM | 4:00 AM +1 day |
| 8:00 PM | 5:00 AM +1 day |
| 9:00 PM | 6:00 AM +1 day |
| 10:00 PM | 7:00 AM +1 day |
| 11:00 PM | 8:00 AM +1 day |
Best Meeting Window
Top meeting times for teams in GMT and JST (9 AM -- 6 PM work hours, 1-hour meeting).
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for GMT. Note: 1 timezone(s) have a DST transition within 14 days.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for GMT. Note: 1 timezone(s) have a DST transition within 14 days.
1 of 2 members within working hours. 1 in mid-day range (9 AM–5 PM). Outside work hours for JST. Note: 1 timezone(s) have a DST transition within 14 days.
Scheduling Tips
- Schedule meetings between 8:00-9:00 AM GMT / 5:00-6:00 PM JST to catch the UK morning and the final hour of the Japanese workday.
- During BST, the overlap improves -- 8:00-10:00 AM BST / 4:00-6:00 PM JST gives you a full 2-hour window.
- Avoid scheduling after 10:00 AM GMT as that pushes past 7:00 PM JST and into personal time in Japan.
- For async handoffs, have the Tokyo team post updates before 6:00 PM JST so London sees them at 9:00 AM GMT the same day.
Time Difference & DST
JST is 9 hours ahead of GMT. GMT is at UTC±0 and JST is at UTC+9.
Upcoming DST Transitions:
The conversion table above reflects the current DST state at build time. Use the interactive converter for live, date-specific conversions.
Major Cities
Greenwich Mean Time (GMT)
- London
- Manchester
- Birmingham
Japan Standard Time (JST)
- Tokyo
- Osaka
- Yokohama
Frequently Asked Questions
What is the time difference between GMT and JST?
Does Japan observe daylight saving time?
What time is 9 AM GMT in Tokyo?
Related Guides
Discover the best meeting windows between GMT/BST and JST. Practical tips for UK–Japan team scheduling.
Scheduling Across Time Zones: Best Practices for Global TeamsProven strategies for scheduling meetings across multiple time zones. Reduce late-night calls and improve team fairness.
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