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UK to JST time converter
Japan is 8 hours ahead of London for 210 days of 2026, and 9 hours ahead of for the other 155 days, because daylight saving changes the gap.
UK to JST conversion table
Local time in London and the matching time in Japan on two reference dates, one in winter and one in summer for the northern hemisphere.
| London (UK) | Japan on 15 January | Japan on 15 July |
|---|---|---|
| 08:00 | 17:00 | 16:00 |
| 09:00 | 18:00 | 17:00 |
| 10:00 | 19:00 | 18:00 |
| 12:00 | 21:00 | 20:00 |
| 15:00 | 00:00 (+1 day) | 23:00 |
| 17:00 | 02:00 (+1 day) | 01:00 (+1 day) |
| 18:00 | 03:00 (+1 day) | 02:00 (+1 day) |
| 21:00 | 06:00 (+1 day) | 05:00 (+1 day) |
Best meeting times between London and Japan
- January: No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-12:00 UK = 16:00-21:00 JST.
- July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-13:00 UK = 15:00-21:00 JST.
Want to add more people? The meeting planner starts with these two zones and lets you add up to four more.
Daylight saving between UK and JST
- London moves its clocks forward on 29 March and back on 25 October in 2026.
- Japan does not change its clocks in 2026.
- The gap is 8 hours for 210 days and 9 hours for 155 days of 2026.
About the two zones
London. The UK is on GMT (UTC+0) in winter and British Summer Time (UTC+1) from the last Sunday of March to the last Sunday of October.
Japan. Japan Standard Time is UTC+9 all year with no daylight saving.
Frequently asked questions
What time is 9 AM UK in JST?
On 15 January, 09:00 in London is 18:00 in Japan. On 15 July it is 17:00.
What is the time difference between London and Japan?
Japan is 8 hours ahead of London for 210 days of 2026, and 9 hours ahead of for the other 155 days, because daylight saving changes the gap.
Does the time difference between UK and JST change during the year?
Yes. London changes its clocks and Japan does not, so the gap moves between 8 and 9 hours. Always convert with the actual date.
When is the best time for a meeting between London and Japan?
No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-12:00 UK = 16:00-21:00 JST. In July: No overlap inside both working days. The closest flexible hours (07:00-21:00): 07:00-13:00 UK = 15:00-21:00 JST.
More conversions
Need the time in a scheduler? Convert a local-time cron schedule to UTC, or see which jobs a clock change affects with the DST collision simulator.