Time Difference Between Japan and London
As of 31 August 2026, London is 8 hours behind Japan. That number is not constant. Over the course of a year, because of daylight saving changes, London, United Kingdom ranges from 9 hours behind to 8 hours behind relative to Tokyo, Japan. The calculator below is always up to date.
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Tokyo, Japan
07:34
Tue, Sep 1, 2026
UTC+9 · Asia/Tokyo
London, United Kingdom
-8h23:34
Mon, Aug 31, 2026
UTC+1 · Europe/London
London is 8 hours behind Japan.
When it is 07:34 in Japan, it is already the previous day in London.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| Japan | Tuesday, September 1, 2026 | Asia/Tokyo | UTC+9 | Not observed |
| London | Monday, August 31, 2026 | Europe/London | UTC+1 | Active now |
Hour by hour: Japan to London
Every hour of today in Japan and what it is in London. Highlighted rows fall inside London working hours (09:00–18:00).
| Japan | London |
|---|---|
| 00:00 | 16:00prev day |
| 01:00 | 17:00prev day |
| 02:00 | 18:00prev day |
| 03:00 | 19:00prev day |
| 04:00 | 20:00prev day |
| 05:00 | 21:00prev day |
| 06:00 | 22:00prev day |
| 07:00 | 23:00prev day |
| 08:00 | 00:00 |
| 09:00 | 01:00 |
| 10:00 | 02:00 |
| 11:00 | 03:00 |
| Japan | London |
|---|---|
| 12:00 | 04:00 |
| 13:00 | 05:00 |
| 14:00 | 06:00 |
| 15:00 | 07:00 |
| 16:00 | 08:00 |
| 17:00 | 09:00 |
| 18:00 | 10:00 |
| 19:00 | 11:00 |
| 20:00 | 12:00 |
| 21:00 | 13:00 |
| 22:00 | 14:00 |
| 23:00 | 15:00 |
Best time to call or meet
Overlapping working hours
17:00–18:00 in Japan (09:00–10:00 in London)
Both places are inside 09:00–18:00 for 1 hour a day. Anything in this window works without asking anyone to stay late.
Reasonable calling hours
16:00–21:00 in Japan (08:00–13:00 in London)
Both people are awake and available between 08:00 and 21:00 local time during this window.
When this difference changes
London puts its clocks back on Sunday, October 25, 2026
The local offset moves from UTC+1 to UTC. After that date, London is 9 hours behind Japan — instead of 8 hours behind, as it is today.
Planning something with more than two places?
Adding a third city usually kills the obvious answer. The Meeting Time Finder takes up to five cities at once and shows only the hours that work for everybody.
Japan and London: common questions
What is the time difference between Japan and London?
As of 31 August 2026, London is 8 hours behind Japan. The gap is not fixed: across the year, London ranges from 9 hours behind to 8 hours behind relative to Japan, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in Japan, what time is it in London?
It is 01:00 AM in London, United Kingdom. Use the time field in the calculator above to check any other hour.
Is London ahead of or behind Japan?
London is behind Japan by 8 hours at the moment. In practical terms, the working day in London starts and ends later in Japan terms.
Do Japan and London observe daylight saving time?
London changes its clocks twice a year; Japan does not. The difference therefore shifts by an hour when London switches: across the year, London ranges from 9 hours behind to 8 hours behind relative to Japan.
What is the best time to call London from Japan?
Working hours overlap between 17:00 and 18:00 Japan time, which is 09:00 to 10:00 in London. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for Tokyo, Japan (UTC+9) and London, United Kingdom (UTC+1) were generated on Monday, August 31, 2026 UTC and refresh in your browser.