Time Difference: London and Los Angeles
Los Angeles is 8 hours behind London for most of the year and 7 hours behind for a few weeks. 9:00 AM in London is 1:00 AM in Los Angeles normally and 2:00 AM in the 7-hour weeks.
London Closes Just as Los Angeles Opens
Los Angeles is UTC-8 in winter and UTC-7 in summer. London is UTC+0 on GMT and UTC+1 on BST. When both are on the same season the gap is 8 hours, and London's 5:00 PM close is Los Angeles's 9:00 AM start, so the two working days touch without overlapping.
London's last working hour, 4:00 to 5:00 PM, is 8:00 AM to 9:00 AM in Los Angeles, before the Pacific day has started. 9:00 AM in Los Angeles is 5:00 PM in London, the end of the London day.
Hours Where Both Cities Are at Work
Each row is an hour of the London day. With the usual 8-hour gap no row gets a check mark. In the 7-hour weeks, London's 4:00 to 5:00 PM hour is 9:00 AM to 10:00 AM in Los Angeles, which is inside both working days, and that is the only shared hour in the whole year.
| London | Los Angeles (GMT → PST) | Los Angeles (BST → PDT) | Los Angeles (GMT → PDT) |
|---|---|---|---|
| 8:00 AM | 12:00 AM | 12:00 AM | 1:00 AM |
| 9:00 AM | 1:00 AM | 1:00 AM | 2:00 AM |
| 10:00 AM | 2:00 AM | 2:00 AM | 3:00 AM |
| 11:00 AM | 3:00 AM | 3:00 AM | 4:00 AM |
| 12:00 PM | 4:00 AM | 4:00 AM | 5:00 AM |
| 1:00 PM | 5:00 AM | 5:00 AM | 6:00 AM |
| 2:00 PM | 6:00 AM | 6:00 AM | 7:00 AM |
| 3:00 PM | 7:00 AM | 7:00 AM | 8:00 AM |
| 4:00 PM | 8:00 AM | 8:00 AM | 9:00 AM ✓ |
| 5:00 PM | 9:00 AM | 9:00 AM | 10:00 AM |
| 6:00 PM | 10:00 AM | 10:00 AM | 11:00 AM |
Each row is an hour of the London day. A check mark means both cities are inside a 9 AM to 5 PM working day at that moment.
- GMT → PST: no shared working hours.
- BST → PDT: no shared working hours.
- GMT → PDT: 1 hour shared, 4:00 PM to 5:00 PM London time.
The Weeks When the Gap Is 7 Hours
The US and the UK change clocks on different dates, so for two short stretches only one side is on summer time:
- From the second Sunday in March (the US moves forward) to the last Sunday in March (the UK follows): 2 to 3 weeks.
- From the last Sunday in October (the UK moves back) to the first Sunday in November (the US follows): 1 week.
A recurring 4:00 PM London call that is 8:00 AM in Los Angeles most weeks is 9:00 AM in those weeks, so the Los Angeles attendee joins an hour later on their own clock.
London Hours in Los Angeles Time
Each column is one real season of the London-Los Angeles gap. Pick the column that matches your date.
| 🇬🇧 London (GMT) | 🇺🇸 Los Angeles (GMT → PST) | 🇺🇸 Los Angeles (BST → PDT) | 🇺🇸 Los Angeles (GMT → PDT) |
|---|---|---|---|
| 00:00 | 16:00(prev day) | 16:00(prev day) | 17:00(prev day) |
| 03:00 | 19:00(prev day) | 19:00(prev day) | 20:00(prev day) |
| 06:00 | 22:00(prev day) | 22:00(prev day) | 23:00(prev day) |
| 09:00 | 01:00 | 01:00 | 02:00 |
| 12:00 | 04:00 | 04:00 | 05:00 |
| 15:00 | 07:00 | 07:00 | 08:00 |
| 18:00 | 10:00 | 10:00 | 11:00 |
| 21:00 | 13:00 | 13:00 | 14:00 |
- GMT → PST: first Sunday in November to second Sunday in March, while both are on standard time
- BST → PDT: last Sunday in March to last Sunday in October, while both are on summer time
- GMT → PDT: a few weeks from the second Sunday in March, and about a week from the last Sunday in October, when only the US is on summer time
* "next day" / "prev day" = the converted time falls on a different calendar date.
A 4:30 PM London Call With a Los Angeles Colleague
A London team that calls Los Angeles at 4:30 PM reaches 8:30 AM in most weeks and 9:30 AM in the 7-hour weeks. The first is early for anyone who starts at 9:00 AM; the second is a normal working hour.
If Los Angeles hosts at 9:00 AM, London joins at 5:00 PM in most weeks and 4:00 PM in the 7-hour weeks, which is late in the London day either way.