Convert JST to GMT
Japan Standard Time (JST) to Greenwich Mean Time (GMT)
Japanese corporations with UK and European operations -- spanning automotive (Toyota Derbyshire plant, Nissan Sunderland plant), finance (Nomura, Daiwa London offices), and technology partnerships -- convert JST to GMT for board calls, market handoffs, and cross-regional standups. The 9-hour gap means Tokyo mornings catch London's previous evening, and the only productive overlap is when Tokyo stays late or London starts early.
When it's 12:00 PM JST, it's 3:00 AM GMT
Interactive Converter
Pick any time and date to convert between JST and GMT.
JST to GMT Conversion Table
Full 24-hour comparison. Business hours (9 AM -- 6 PM) are highlighted.
| JST | GMT |
|---|---|
| 12:00 AM | 3:00 PM -1 day |
| 1:00 AM | 4:00 PM -1 day |
| 2:00 AM | 5:00 PM -1 day |
| 3:00 AM | 6:00 PM -1 day |
| 4:00 AM | 7:00 PM -1 day |
| 5:00 AM | 8:00 PM -1 day |
| 6:00 AM | 9:00 PM -1 day |
| 7:00 AM | 10:00 PM -1 day |
| 8:00 AM | 11:00 PM -1 day |
| 9:00 AM | 12:00 AM |
| 10:00 AM | 1:00 AM |
| 11:00 AM | 2:00 AM |
| 12:00 PM | 3:00 AM |
| 1:00 PM | 4:00 AM |
| 2:00 PM | 5:00 AM |
| 3:00 PM | 6:00 AM |
| 4:00 PM | 7:00 AM |
| 5:00 PM | 8:00 AM |
| 6:00 PM | 9:00 AM |
| 7:00 PM | 10:00 AM |
| 8:00 PM | 11:00 AM |
| 9:00 PM | 12:00 PM |
| 10:00 PM | 1:00 PM |
| 11:00 PM | 2:00 PM |
Best Meeting Window
Top meeting times for teams in JST and GMT (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 at 5:00-6:00 PM JST / 8:00-9:00 AM GMT to catch both teams during or near working hours.
- During BST (late March to late October), the overlap improves to 4:00-6:00 PM JST / 8:00-10:00 AM BST -- use the wider window for longer discussions.
- 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
GMT is 9 hours behind JST. JST is at UTC+9 and GMT is at UTC±0.
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
Japan Standard Time (JST)
- Tokyo
- Osaka
- Yokohama
Greenwich Mean Time (GMT)
- London
- Manchester
- Birmingham
Frequently Asked Questions
What is the time difference between JST and GMT?
What is 9:00 AM JST in London time?
When is the best time for a call from Tokyo to London?
Does Japan observe daylight saving time?
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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