Time Difference Between London and San Francisco
As of 31 August 2026, San Francisco is 8 hours behind London. That number is not constant. Over the course of a year, because of daylight saving changes, San Francisco, United States ranges from 8 hours behind to 7 hours behind relative to London, United Kingdom. The calculator below is always up to date.
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London, United Kingdom
23:34
Mon, Aug 31, 2026
UTC+1 · Europe/London
San Francisco, United States
-8h15:34
Mon, Aug 31, 2026
UTC-7 · PDT · America/Los_Angeles
San Francisco is 8 hours behind London.
Time zone details
| Place | Local date | Time zone | UTC offset | Summer time |
|---|---|---|---|---|
| London | Monday, August 31, 2026 | Europe/London | UTC+1 | Active now |
| San Francisco | Monday, August 31, 2026 | PDTAmerica/Los_Angeles | UTC-7 | Active now |
Hour by hour: London to San Francisco
Every hour of today in London and what it is in San Francisco. Highlighted rows fall inside San Francisco working hours (09:00–18:00).
| London | San Francisco |
|---|---|
| 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 |
| London | San Francisco |
|---|---|
| 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 London (09:00–10:00 in San Francisco)
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 London (08:00–13:00 in San Francisco)
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, San Francisco is 7 hours behind London — instead of 8 hours behind, as it is today.
San Francisco puts its clocks back on Sunday, November 1, 2026
The local offset moves from UTC-7 to UTC-8. The gap between London and San Francisco stays at 8 hours because both places change at the same time.
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.
London and San Francisco: common questions
What is the time difference between London and San Francisco?
As of 31 August 2026, San Francisco is 8 hours behind London. The gap is not fixed: across the year, San Francisco ranges from 8 hours behind to 7 hours behind relative to London, as clocks change. The calculator on this page always shows the difference for right now.
When it is 9:00 AM in London, what time is it in San Francisco?
It is 01:00 AM in San Francisco, United States. Use the time field in the calculator above to check any other hour.
Is San Francisco ahead of or behind London?
San Francisco is behind London by 8 hours at the moment. In practical terms, the working day in San Francisco starts and ends later in London terms.
Do London and San Francisco observe daylight saving time?
Both London and San Francisco change their clocks, but not on the same dates. That is why the gap is not fixed: across the year, San Francisco ranges from 8 hours behind to 7 hours behind relative to London.
What is the best time to call San Francisco from London?
Working hours overlap between 17:00 and 18:00 London time, which is 09:00 to 10:00 in San Francisco. Calls inside that window reach both sides during the normal working day.
Related comparisons
Local dates shown for London, United Kingdom (UTC+1) and San Francisco, United States (UTC-7) were generated on Monday, August 31, 2026 UTC and refresh in your browser.