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About this tool
Convert time between London and San Francisco with live clocks and the current, daylight-saving-aware time difference.
See what time it is in San Francisco when you know the time in London — this converter shows both cities' clocks live and the exact current time difference between them, adjusted automatically for daylight saving. London runs on the Europe/London zone (GMT) and San Francisco on America/Los_Angeles (PT); the tool reads your browser's own time-zone data, so the offset is always right even across the days each city changes its clocks. Type any London time to pin the matching San Francisco time, or press swap to convert the other way. Nothing is uploaded.
Open London to San Francisco Time Converter on AltFTool — it loads instantly in your browser.
Read the live clocks at the top for the current time in London and San Francisco.
Type a specific time into the London field to see the matching San Francisco time and date.
Press swap to convert San Francisco times to London instead.
The current local time in London and San Francisco updates every second, with each city's UTC offset and abbreviation shown.
Offsets come from the browser's IANA time-zone database, so the difference is correct on either side of a daylight-saving change — no stale table.
Enter a specific London time to see the exact San Francisco time for today, including the date if the conversion crosses midnight.
It runs entirely in your browser — no account, and no times are sent anywhere.
It can change through the year because one or both cities observe daylight saving, so the converter above shows the current difference live rather than a fixed number. London uses Europe/London and San Francisco uses America/Los_Angeles.
Type 9:00 into the London field above and the converter shows the matching San Francisco time for today, daylight saving included. It also shows the San Francisco date in case the time crosses midnight.
Yes. It uses your browser's own time-zone data (Europe/London for London, America/Los_Angeles for San Francisco), which carries each region's daylight-saving rules, so the result stays correct all year.
Yes — press the swap button and the converter flips to show San Francisco → London, with the same live clocks and time picker.
It relies on the standard IANA time-zone database built into your browser, not an approximation, and makes no network calls, so your times stay on your device.
Add the London to San Francisco Time Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
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