Yokohama time now, London time now
Yokohama stays on Japan Standard Time (UTC+9) all year. No clock changes, no summer time. London shifts between GMT (UTC+0) and BST (UTC+1). The gap between the two cities is never fixed.
From the last Sunday in October to the last Sunday in March, London runs on GMT. Yokohama is 9 hours ahead. From the last Sunday in March to the last Sunday in October, London runs on BST. Yokohama is 8 hours ahead.
Subtract 8 or 9 hours from Yokohama time to get London time. For most of the year, the gap is 8 hours.
JST (UTC+9) vs GMT (UTC+0): 9-hour difference
During London's winter months on GMT:
- 09:00 in Yokohama is 00:00 (midnight) in London.
- 16:00 in Yokohama is 07:00 in London.
- 21:00 in Yokohama is 12:00 (noon) in London.
JST (UTC+9) vs BST (UTC+1): 8-hour difference
During London's summer months on BST:
- 09:00 in Yokohama is 01:00 in London.
- 16:00 in Yokohama is 08:00 in London.
- 21:00 in Yokohama is 13:00 in London.
Why London changes its clocks but Yokohama doesn't
Japan tried daylight saving time once, from 1948 to 1951, then abolished it. Farmers hated the disrupted schedules. Educators warned about children walking to school in darker mornings. No serious reintroduction has succeeded since. Yokohama's offset stays at UTC+9.
The UK has observed BST every year since 1972. Clocks go forward on the last Sunday of March and back on the last Sunday of October. That single shift is what changes the Yokohama, London gap from 9 hours to 8, and back again.
When to call London from Yokohama
Yokohama afternoon equals European morning. That is the only realistic window for a live call.
Aim for 16:00 to 18:00 in Yokohama. That lands in London at 08:00 to 10:00 BST (summer) or 07:00 to 09:00 GMT (winter). Anything earlier in Yokohama falls before dawn in London. Anything later pushes into the London afternoon when energy dips.
| Yokohama time | London time (BST) | London time (GMT) |
|---|---|---|
| 16:00 | 08:00 | 07:00 |
| 17:00 | 09:00 | 08:00 |
| 18:00 | 10:00 | 09:00 |
When to call Yokohama from London
Start your call between 08:00 and 10:00 BST (or 07:00 and 09:00 GMT). That hits Yokohama's late afternoon, 16:00 to 18:00. Most office workers are still at their desks. Do not leave it later: a 17:00 London start lands at 01:00 or 02:00 in Yokohama.
Yokohama to London time converter
| Yokohama (JST) | London (BST, summer) | London (GMT, winter) |
|---|---|---|
| 07:00 | 23:00 (previous day) | 22:00 (previous day) |
| 09:00 | 01:00 | 00:00 |
| 12:00 | 04:00 | 03:00 |
| 15:00 | 07:00 | 06:00 |
| 18:00 | 10:00 | 09:00 |
| 21:00 | 13:00 | 12:00 |
| 23:00 | 15:00 | 14:00 |
When the Yokohama, London gap changes next
Mark the last Sunday of March and the last Sunday of October. Those are the two days the offset shifts. A recurring meeting set for 16:00 Yokohama time will jump from 07:00 to 08:00 London time in March, then drop back in October. Miss the transition and you show up an hour early or late.
For calling windows to other cities, see the best times to call Yokohama. If you are flying between the two cities, the Yokohama jet lag guide has arrival-time advice tailored to your direction of travel.