London to Los Angeles Time Converter
Los Angeles is 8 hours behind London for most of the year. 9:00 AM in London is 1:00 AM in Los Angeles in winter, and the same 1:00 AM in summer. For a few weeks the gap is 7 hours, and the same 9:00 AM becomes 2:00 AM.
Where London's Day Ends and Los Angeles's Begins
On a strict 9-to-5 schedule the two days touch without overlapping. London's 5 PM close is Los Angeles's 9 AM start in most weeks, so 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. In the 7-hour weeks the same hour is 9:00 AM to 10:00 AM in Los Angeles, which is inside both working days.
| London | Los Angeles |
|---|---|
| 4:00 PM–5:00 PM | 8:00 AM–9:00 AM |
| GMT → PST: London: inside 9 AM–5 PM. Los Angeles: before 9 AM. Winter: London's last hour is Los Angeles's early morning. | |
| 4:00 PM–5:00 PM | 8:00 AM–9:00 AM |
| BST → PDT: London: inside 9 AM–5 PM. Los Angeles: before 9 AM. Summer: same 8-hour gap as winter, so the same early-morning result. | |
| 4:00 PM–5:00 PM | 9:00 AM–10:00 AM |
| GMT → PDT: Both inside 9 AM–5 PM Transition weeks: the only time a shared hour opens up. | |
"Inside 9 AM–5 PM" is a planning assumption for a standard office day on each side, not a claim about any company's hours.
Why It Is 8 Hours Almost All Year
London is on GMT (UTC+0) in winter and BST (UTC+1) in summer, switching on the last Sunday in March and the last Sunday in October. Los Angeles is on PST (UTC-8) in winter and PDT (UTC-7) in summer, switching on the second Sunday in March and the first Sunday in November. When both are on winter time or both on summer time the gap is 8 hours.
Because the two countries switch on different dates, there are two short stretches when only one side is on summer time. In those weeks Los Angeles is just 7 hours behind.
The Seven-Hour Weeks
| Stretch | Gap |
|---|---|
| Early January to second Sunday in March | 8 hours (GMT and PST) |
| Second Sunday to last Sunday in March (2 to 3 weeks) | 7 hours (London still on GMT, Los Angeles on PDT) |
| Last Sunday in March to last Sunday in October | 8 hours (BST and PDT) |
| Last Sunday in October to first Sunday in November (1 week) | 7 hours (London back on GMT, Los Angeles still on PDT) |
| First Sunday in November to end of year | 8 hours (GMT and PST) |
London Hours in Los Angeles Time
Full 24-hour reference table. Use the live clocks above for the exact current offset.
| 🇬🇧 GMT/BST | 🇺🇸 GMT → PSTUTC+0 to UTC-8, winter | 🇺🇸 BST → PDTUTC+1 to UTC-7, summer | 🇺🇸 GMT → PDTUTC+0 to UTC-7, a few weeks a year |
|---|---|---|---|
| 00:00 | 4:00 PMprev day | 4:00 PMprev day | 5:00 PMprev day |
| 01:00 | 5:00 PMprev day | 5:00 PMprev day | 6:00 PMprev day |
| 02:00 | 6:00 PMprev day | 6:00 PMprev day | 7:00 PMprev day |
| 03:00 | 7:00 PMprev day | 7:00 PMprev day | 8:00 PMprev day |
| 04:00 | 8:00 PMprev day | 8:00 PMprev day | 9:00 PMprev day |
| 05:00 | 9:00 PMprev day | 9:00 PMprev day | 10:00 PMprev day |
| 06:00 | 10:00 PMprev day | 10:00 PMprev day | 11:00 PMprev day |
| 07:00 | 11:00 PMprev day | 11:00 PMprev day | 12:00 AM |
| 08:00 | 12:00 AM | 12:00 AM | 1:00 AM |
| 09:00 | 1:00 AM | 1:00 AM | 2:00 AM |
| 10:00 | 2:00 AM | 2:00 AM | 3:00 AM |
| 11:00 | 3:00 AM | 3:00 AM | 4:00 AM |
| 12:00 | 4:00 AM | 4:00 AM | 5:00 AM |
| 13:00 | 5:00 AM | 5:00 AM | 6:00 AM |
| 14:00 | 6:00 AM | 6:00 AM | 7:00 AM |
| 15:00 | 7:00 AM | 7:00 AM | 8:00 AM |
| 16:00 | 8:00 AM | 8:00 AM | 9:00 AM |
| 17:00 | 9:00 AM | 9:00 AM | 10:00 AM |
| 18:00 | 10:00 AM | 10:00 AM | 11:00 AM |
| 19:00 | 11:00 AM | 11:00 AM | 12:00 PM |
| 20:00 | 12:00 PM | 12:00 PM | 1:00 PM |
| 21:00 | 1:00 PM | 1:00 PM | 2:00 PM |
| 22:00 | 2:00 PM | 2:00 PM | 3:00 PM |
| 23:00 | 3:00 PM | 3:00 PM | 4:00 PM |
"prev day" = converted time falls on the previous calendar day.
Booking a Call Without Getting Caught
A late London meeting is an early California one. 4:00 PM in London is 8:00 AM in Los Angeles in most weeks and 9:00 AM in the transition weeks, so a call booked with the usual rule is an hour out if it falls between the second Sunday and the last Sunday in March, or between the last Sunday in October and the first Sunday in November.
Going the other way, 9:00 AM in Los Angeles is 5:00 PM in London in winter, 5:00 PM in summer and 4:00 PM in the 7-hour weeks. If you need a Los Angeles attendee at their desk, London has to hold the call in its late afternoon.