Time difference between California and London
World time board
California · United StatesUTC-07:00
04:10 PMSAT 03.10.2026
Now 04:10 PM|Live
Drag or scroll · click an hour · ◀ ▶ by hour · 3 days of range
Work–
daydawn / dusknight
- Time difference
- California is 8 hours behind
- Changes with DST
- Yes
- Day difference
- 1 day ahead
- Typical workday overlap (9am–6pm)
- 1 hour
| California | London |
|---|---|
| 00:00 | 08:00 |
| 01:00 | 09:00 |
| 02:00 | 10:00 |
| 03:00 | 11:00 |
| 04:00 | 12:00 |
| 05:00 | 13:00 |
| 06:00 | 14:00 |
| 07:00 | 15:00 |
| 08:00 | 16:00 |
| 09:00 | 17:00 |
| 10:00 | 18:00 |
| 11:00 | 19:00 |
| 12:00 | 20:00 |
| 13:00 | 21:00 |
| 14:00 | 22:00 |
| 15:00 | 23:00 |
| 16:00 | 00:00+1 |
| 17:00 | 01:00+1 |
| 18:00 | 02:00+1 |
| 19:00 | 03:00+1 |
| 20:00 | 04:00+1 |
| 21:00 | 05:00+1 |
| 22:00 | 06:00+1 |
| 23:00 | 07:00+1 |
How the time difference changes over the next 12 months
| Period | Difference |
|---|---|
| until October 24, 2026 | California is 8 hours behind |
| October 24, 2026 – November 1, 2026 | California is 7 hours behind |
| November 1, 2026 – March 14, 2027 | California is 8 hours behind |
| March 14, 2027 – March 27, 2027 | California is 7 hours behind |
| from March 27, 2027 | California is 8 hours behind |
Both change their clocks, but on different dates, so for part of the year the difference is an hour off.
Working hours
With a 9:00 AM–6:00 PM working day in both places, the shared hours are 9:00 AM–10:00 AM in California, which is 5:00 PM–6:00 PM in London (1 hour a day).
From 4:00 PM to midnight in California, it is already the next day in London.
Frequently asked questions
- What is the time difference between California and London?
- California is 8 hours behind London. October 24, 2026 – November 1, 2026: California is 7 hours behind London.
- Does the time difference between California and London change during the year?
- Yes. Both change their clocks, but on different dates, so for part of the year the difference is an hour off. October 24, 2026 – November 1, 2026: California is 7 hours behind London.