When it is 09:00 in San Francisco it is 17:00 in London in January and 17:00 in July. London is 8 hours ahead San Francisco right now — and the difference is the same all year. This page gives the live times in both cities, the overlap between their working days, the daylight saving dates that move the difference, and the best meeting windows.
Try the tool: Time Zone Converter — convert any time between San Francisco and London, with the offset for the date you pick.
Live times in San Francisco and London
The two cities side by side. The January column uses the winter offsets (San Francisco UTC−08:00, London UTC+00:00); the July column uses the summer offsets (San Francisco UTC−07:00, London UTC+01:00).
| Time in San Francisco | London in January | London in July |
|---|---|---|
| 00:00 | 08:00 | 08:00 |
| 06:00 | 14:00 | 14:00 |
| 09:00 | 17:00 | 17:00 |
| 12:00 | 20:00 | 20:00 |
| 15:00 | 23:00 | 23:00 |
| 17:00 | 01:00 | 01:00 |
| 21:00 | 05:00 | 05:00 |
The world clock shows the current time in both cities live, and the individual city pages — time in San Francisco and time in London — explain each city's time zone, offsets and daylight saving in full.
The time difference between San Francisco and London
The difference is constant: London is 8 hours ahead San Francisco on every day of the year. That is the simplest case in time-zone work — the answer does not depend on the date, and a meeting set for 09:00 in San Francisco is always 17:00 in London. The reason the difference never changes is that both cities observe daylight saving and change their clocks on the same dates.
To convert a time, add the difference: 09:00 in San Francisco is 17:00 in London in January and 17:00 in July; 17:00 in San Francisco — the end of the working day — is 01:00 in London in January and 01:00 in July. To go the other way, subtract it: 09:00 in London is 01:00 in San Francisco in January. The time difference calculator does the arithmetic for any date, and the UTC to London page gives the full conversion table for London.
Meeting overlap between San Francisco and London
The overlap is the hours when both cities are in their working day (09:00–17:00 local time). The table marks the overlapping hours in San Francisco's working day and shows what time they are in London.
January
| San Francisco time | London time | Both working? |
|---|---|---|
| 09:00 | 17:00 | Yes |
| 10:00 | 18:00 | Yes |
| 11:00 | 19:00 | Yes |
| 12:00 | 20:00 | Yes |
| 13:00 | 21:00 | Yes |
| 14:00 | 22:00 | Yes |
| 15:00 | 23:00 | Yes |
| 16:00 | 00:00 | Yes |
In January the overlap is 8 hours: 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 San Francisco time. In July it is 8 hours: 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 San Francisco time. The meeting planner finds the overlap for any two cities and any date, and the meeting time finder finds it for a whole team.
Daylight saving in San Francisco and London
San Francisco observes daylight saving: in 2026 the clocks go forward on 8 March 2026 and back on 1 November 2026, moving the offset from UTC−08:00 to UTC−07:00.
London observes daylight saving: in 2026 the clocks go forward on 29 March 2026 and back on 25 October 2026, moving the offset from UTC+00:00 to UTC+01:00.
The difference changes on Sunday, 8 March 2026 and Sunday, 29 March 2026 and Sunday, 25 October 2026 and Sunday, 1 November 2026 in 2026. On those dates, one city changes its clocks and the other does not — or they change on different days — so the difference moves by an hour. A standing meeting set in one city's local time will land an hour early or late on the other side until the second city catches up. The fix is to set the calendar event in UTC, or to check the overlap again after each change. The individual DST pages — San Francisco DST 2026 and London DST 2026 — give the exact dates for each city.
Best meeting windows
The best windows in January are 09:00–17:00 in San Francisco (17:00–01:00 in London). These are the hours inside both working days, so nobody is up early or late. It is a short window, so keep the meeting short and send an agenda in advance.
Calling and travel notes
When it is 09:00 in San Francisco it is 17:00 in London in January; when it is 12:00 in San Francisco it is 20:00 in London; when it is 17:00 in San Francisco it is 01:00 in London. The difference is under 12 hours, so the two cities are usually on the same date — but check the date for late-evening and early-morning times, when the date can differ by a day. Scheduling between the Americas and Europe is the easiest intercontinental case: the difference is 5–9 hours, so the working days overlap for several hours. The best window is late morning in San Francisco and afternoon in London (or the reverse), when both sides are in their working day. Watch the three weeks in March when the United States has changed its clocks and Europe has not — the overlap shifts by an hour, and standing meetings land at the wrong time.
Worked conversions
Six conversions, for January (offsets San Francisco UTC−08:00, London UTC+00:00):
| San Francisco | London |
|---|---|
| 08:00 | 16:00 |
| 09:00 | 17:00 |
| 12:00 | 20:00 |
| 14:00 | 22:00 |
| 17:00 | 01:00 |
| 20:00 | 04:00 |
In July, the answers are the same. For the reverse direction, see London to San Francisco time.
San Francisco and London at a glance
| Fact | San Francisco | London |
|---|---|---|
| Country | United States | United Kingdom |
| Region | Americas | Europe |
| IANA time zone | America/Los_Angeles |
Europe/London |
| Standard offset | UTC−08:00 | UTC+00:00 |
| Daylight saving offset | UTC−07:00 | UTC+01:00 |
| Offset in January 2026 | UTC−08:00 | UTC+00:00 |
| Offset in July 2026 | UTC−07:00 | UTC+01:00 |
| Observes daylight saving | Yes | Yes |
The table is the whole pair in one place. The two numbers that matter most are the January and July offsets: if they are the same in both columns for a city, that city's offset never changes; if they differ, the city observes daylight saving and the difference between the cities moves with it. The individual city pages — time in San Francisco and time in London — explain each city's time zone, and the DST pages — San Francisco DST 2026 and London DST 2026 — give the exact change dates.
Frequently asked questions
What is the time difference between San Francisco and London?
London is 8 hours ahead San Francisco right now. In January the difference is 8 hours ahead and in July it is 8 hours ahead — it is the same all year.
How do I schedule a recurring meeting between San Francisco and London?
Pick a time inside the overlap — 09:00–17:00 San Francisco time — and set the calendar event in UTC so it moves correctly when the clocks change. Re-check the overlap in March and October, when the difference moves, and rotate the time if the meeting falls outside someone's working day.
What time is it in London when it is 09:00 in San Francisco?
It is 17:00 in January and 17:00 in July. The time zone converter gives the answer for any date.
What is the best time for a meeting between San Francisco and London?
The best windows in January are 09:00–17:00 San Francisco time — inside both working days.
Does the time difference between San Francisco and London change during the year?
No. The difference is 8 hours ahead all year, because both cities change their clocks on the same dates.
What time is it in San Francisco when it is 09:00 in London?
It is 01:00 in January and 01:00 in July. See London to San Francisco time for the full comparison from London's side.
What are the time zones of San Francisco and London?
San Francisco is in America/Los_Angeles (UTC−08:00 standard time) and London is in Europe/London (UTC+00:00 standard time).
What time is it in San Francisco when it is midnight in London?
It is 16:00 in San Francisco in January and 16:00 in July — the same day, because San Francisco is ahead of London. Midnight conversions are the ones that most often land on the wrong date, so always check the date as well as the time.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's time zone converter and meeting planner — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.