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Location 1 UTC offset
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Location 2 UTC offset
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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).
Winter difference
+9h
GMT vs JST (Oct–Mar)
Summer difference
+8h
BST vs JST (Mar–Oct)
London timezone
GMT / BST
UTC+0 / UTC+1
Tokyo timezone
JST
UTC+9
Best Times to Schedule a Meeting
With an 8–9 hour gap, the best meeting window is 08:00–12:00 London time, which falls in Tokyo late afternoon (15:00–20:00 depending on season).
| London time | Tokyo time | Season | Suitability |
|---|---|---|---|
| 08:00–09:00 | 16:00–17:00 (winter) / 15:00–16:00 (summer) | All year | OK |
| 09:00–12:00 | 17:00–20:00 (winter) / 16:00–19:00 (summer) | All year | 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 JST (UTC+9). The difference changes only when London switches clocks — late March (9h→8h) and late October (8h→9h).
| Event | London | Tokyo | 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 ahead is Tokyo compared to London?
Tokyo (JST, UTC+9) is 9 hours ahead of London in winter (GMT) and 8 hours ahead in summer (BST). Japan does not observe DST — the difference changes only when the UK switches clocks.
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.
What is the best time to call Tokyo from London?
The best window is 08:00–12:00 London time (17:00–21:00 Tokyo in winter, 16:00–20:00 in summer).
If it is noon in London, what time is it in Tokyo?
Noon in London (GMT) = 21:00 in Tokyo. Noon in London (BST) = 20:00 in Tokyo. Tokyo is always UTC+9.
When does the London–Tokyo time difference change?
Twice a year: London springs forward in late March (9h→8h) and falls back in late October (8h→9h). Tokyo never changes its clocks.
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