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Location 1 UTC offset
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Location 2 UTC offset
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Future date
Time Difference Table
| Location 1 | Location 2 |
|---|
Tokyo (JST, UTC+9) is 8–9 hours ahead of London. Japan does not observe Daylight Saving Time, so the gap changes only when London switches clocks: 9 hours ahead from late October to late March (GMT), and 8 hours ahead from late March to late October (BST).
London is behind by
−9h
Winter (Oct–Mar, GMT)
London is behind by
−8h
Summer (Mar–Oct, BST)
Tokyo timezone
JST
UTC+9
London timezone
GMT / BST
UTC+0 / UTC+1
Best Times to Schedule a Meeting
Tokyo is 8–9 hours ahead of London, making real-time overlap minimal. 08:00–12:00 London time (16:00–20:00 Tokyo in winter, 15:00–19:00 in summer) is the only workable window.
| Tokyo time | London time | Season | Suitability |
|---|---|---|---|
| 08:00 – 12:00 | 16:00–20:00 (winter GMT) | Oct–Mar | Best window |
| 08:00 – 12:00 | 15:00–19:00 (summer BST) | Mar–Oct | Best window |
Time Difference by Month
Highlighted months indicate when a DST transition changes the difference.
Jan
9h
Feb
9h
Mar
9h
Apr
8h
May
8h
Jun
8h
Jul
8h
Aug
8h
Sep
8h
Oct
8h
Nov
9h
Dec
9h
Daylight Saving Time Schedule
Japan does not observe DST. Tokyo is permanently UTC+9 (JST). The gap changes only when London switches clocks — late March (9h→8h) and late October (8h→9h).
| Event | Tokyo | London | Effect |
|---|---|---|---|
| London springs forward | Last Sunday of March, 01:00 | — (no change) | 8h from late March |
| London falls back | Last Sunday of October, 02:00 | — (no change) | 9h from late October |
Frequently Asked Questions
How many hours behind London is Tokyo?
London is 9 hours behind Tokyo in winter (GMT vs JST) and 8 hours behind in summer (BST vs JST). Japan does not observe DST — the difference changes only when London switches clocks.
What time is it in London when it is noon in Tokyo?
When it is 12:00 noon in Tokyo (JST), it is 03:00 in London in winter (GMT), or 04:00 in summer (BST). Tokyo is always UTC+9.
What is the best time to call London from Tokyo?
The best window is 17:00–21:00 Tokyo time in winter (08:00–12:00 London GMT), or 16:00–20:00 Tokyo in summer (08:00–12:00 London BST).
Does Tokyo observe Daylight Saving Time?
No. Japan abolished DST in 1951. Tokyo is permanently UTC+9 (JST) year-round. The difference with London changes only due to the UK's DST schedule.
When does the Tokyo–London time difference change?
Twice a year: when London springs forward in late March (9h→8h gap) and when London falls back in late October (8h→9h gap). Tokyo never changes its clocks.
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