GMT to PST converter
Convert GMT to Pacific Time. Los Angeles is 8 hours behind London for most of the year, and 7 hours behind for a few weeks in spring and autumn.
Los Angeles is 8 hours behind London (GMT vs PST).
London to Los Angeles in practice
London and Los Angeles are separated by the Atlantic, the whole of North America and eight hours of clock. When the UK workday ends at 5 PM, California is still deep in the morning at 9 AM, and the shared overlap is tiny but real.
The reason the gap is not constant is that the US and the UK change their clocks on different dates. The US moves on the second Sunday of March and the first Sunday of November. The UK moves on the last Sunday of March and the last Sunday of October. For about two to three weeks in March and one week in autumn the gap is 7 hours instead of 8.
Teams that span the UK and California usually work from London’s late afternoon and California’s early morning.
Engineering handovers
London finishes its day just as California starts.
- 4:00 PM GMT is 8:00 AM PST
- 5:00 PM GMT is 9:00 AM PST
- 3:00 PM GMT is 7:00 AM PST
The overlap is only the last hour or two of the London day.
Finance and media
The London markets close at 4:30 PM, long before the West Coast is at work.
- The LSE close is 8:30 AM PST
- A UK morning news broadcast at 7:00 AM GMT is 11:00 PM PST the previous evening
- A premiere at 8:00 PM GMT is noon PST
Live sport from Britain is often watched at breakfast in California.
Travel
The flight from London to Los Angeles takes around 11 hours, and the clock change works on your side flying west.
- Depart Heathrow at 11:00 AM GMT, arrive about 2:00 PM PST
- Depart LAX at 4:00 PM PST, land in London around 11:00 AM GMT the next day
- A jet-lag cure is to stay up until local evening
Going west you arrive earlier on the clock than you left.
UK deadlines for Californians
A UK deadline of 5:00 PM GMT is 9:00 AM PST on the same day. A deadline set for midnight GMT is 4:00 PM PST the previous day, which matters for anyone applying to a UK university or grant from California.
In the other direction, a California deadline of 5:00 PM PST lands at 1:00 AM GMT the following day. Most UK offices will have closed 8 hours earlier, so send documents before the end of the London afternoon.
The weeks when the gap is seven hours
Because the US and the UK change clocks on different weekends, there are two short periods each year when the usual 8-hour gap shrinks to 7 hours. In 2027 the first is from the US change in March until the UK change; the second is from the UK change in October until the US change in November. The exact dates are listed below.
- Mar 14, 2027: Los Angeles moves to PDT (UTC−7); the gap becomes 7 hours
- Mar 28, 2027: London moves to BST (UTC+1); the gap becomes 8 hours
- Oct 31, 2027: London moves to GMT (UTC+0); the gap becomes 7 hours
- Nov 7, 2027: Los Angeles moves to PST (UTC−8); the gap becomes 8 hours
A recurring call at 9:00 AM Pacific / 5:00 PM London therefore becomes 4:00 PM London in those weeks unless the invite is bound to both cities.
London to Los Angeles, every hour
Times are for Nov 6, 2026, when Los Angeles is 8 hours behind London. The gap changes on the dates listed above. Green rows are the hours when both places are inside a 9-to-5 day.
| London (GMT) | Los AngelesPST, −8 hrs |
|---|---|
| 12:00 AM (midnight) | 4:00 PM previous day |
| 1:00 AM | 5:00 PM previous day |
| 2:00 AM | 6:00 PM previous day |
| 3:00 AM | 7:00 PM previous day |
| 4:00 AM | 8:00 PM previous day |
| 5:00 AM | 9:00 PM previous day |
| 6:00 AM | 10:00 PM previous day |
| 7:00 AM | 11:00 PM previous day |
| 8:00 AM | 12:00 AM |
| 9:00 AM | 1:00 AM |
| 10:00 AM | 2:00 AM |
| 11:00 AM | 3:00 AM |
| 12:00 PM (noon) | 4:00 AM |
| 1:00 PM | 5:00 AM |
| 2:00 PM | 6:00 AM |
| 3:00 PM | 7:00 AM |
| 4:00 PM | 8:00 AM |
| 5:00 PM | 9:00 AM |
| 6:00 PM | 10:00 AM |
| 7:00 PM | 11:00 AM |
| 8:00 PM | 12:00 PM |
| 9:00 PM | 1:00 PM |
| 10:00 PM | 2:00 PM |
| 11:00 PM | 3:00 PM |
“next day” and “previous day” mean Los Angeles is on a different calendar date from London.
Quick answers
What time is 9 AM GMT in PST?
1:00 AM PST. London is 8 hours ahead of Los Angeles for most of the year.
Is London 8 hours ahead of Los Angeles?
Usually. For a few weeks in March and October/November the gap is 7 hours, because the US and UK change clocks on different dates.
What is 5 PM GMT in California?
9:00 AM PST.
What are overlapping hours for London and LA?
Roughly 9 AM to 11 AM in Los Angeles and 5 PM to 7 PM in London, which are the end of the UK day.
What time is 9 AM PST in London?
5:00 PM GMT in winter.