What is the normal time difference between London and San Francisco?

London is usually 8 hours ahead of San Francisco. London observes GMT (UTC+0) in winter and BST (UTC+1) in summer; San Francisco observes PST (UTC-8) in winter and PDT (UTC-7) in summer. Both cities shift clocks in spring and autumn, keeping the gap at 8 hours for most of the year.

When is the time difference only 7 hours?

There are two brief windows each year when the gap shrinks to 7 hours: mid-March, when the US has already moved to PDT but the UK has not yet started BST; and late October into early November, when the UK has returned to GMT but the US has not yet returned to PST. The rest of the year the difference is 8 hours. This tool shows the real offset live so you always have the correct number.

When does the UK change its clocks?

The UK moves clocks forward on the last Sunday in March at 01:00 GMT (becoming BST, UTC+1) and back on the last Sunday in October at 02:00 BST (returning to GMT, UTC+0).

When does San Francisco (US Pacific) change its clocks?

The US shifts clocks forward on the second Sunday in March at 02:00 PST (becoming PDT, UTC-7) and back on the first Sunday in November at 02:00 PDT (returning to PST, UTC-8).

What are good meeting times for both London and San Francisco?

The best overlap is 16:00–18:00 London time (08:00–10:00 San Francisco time during the standard 8-hour offset). The meeting overlap finder on this page highlights those windows automatically.

Is this tool accurate for scheduling?

Yes. It uses the IANA timezone database embedded in your browser — the same source used by operating systems and calendar apps worldwide. Accuracy depends on your device clock being synchronized via NTP, which most devices do automatically.

Time Difference: London to San Francisco

Name: Time Difference: London to San Francisco
Availability: InStock
Author: Nham Vu

See the current time in London and San Francisco side by side, with the exact hour offset and a business-hours overlap finder, updated live every second.

London, United Kingdom

--:--:--

GMT UTC+0

San Francisco, United States

--:--:--

PST UTC-8

Current Offset

+8 hours

London is 8 hours ahead of San Francisco

Meeting Overlap Finder

Business hours (09:00–18:00) highlighted — best overlap shaded

London	San Francisco	Status

Convert London Time to San Francisco Time

Based on the current offset — updates automatically

London	San Francisco

Summary

See the current time in London and San Francisco side by side, with the exact hour offset and a business-hours overlap finder, updated live every second.

How it works

Your browser reads the current moment from your device clock.
It converts that moment to Europe/London time using the IANA timezone database built into modern browsers.
The same moment is converted to America/Los_Angeles time.
The UTC offsets of both cities are compared to calculate the exact hour difference.
All three values — London time, San Francisco time, and the offset — refresh every second.
DST transitions for both cities are handled automatically, so the offset switches correctly each spring and autumn.

Use cases

Scheduling video calls between London and San Francisco offices.
Checking if a colleague in San Francisco is still at their desk.
Planning transatlantic travel and arrival time comparisons.
Remote teams coordinating daily standups across the UK and US West Coast.
Finding overlapping business hours for London-San Francisco meetings.
Verifying whether both cities currently observe daylight saving time.
Journalists checking broadcast times for live San Francisco tech events.
Students and teachers arranging online lessons across the Atlantic and Pacific.

Frequently Asked Questions

Last updated: 2026-07-25 · Reviewed by Nham Vu