Quick reference
London is 8 hours ahead of PST (Pacific Standard Time, UTC-8) and 8 hours ahead of PDT (Pacific Daylight Time, UTC-7) because both zones observe daylight saving time together. The gap is constant year-round, with brief exceptions during the spring and autumn transition weeks.
The best live-meeting window is 6 AM to 9 AM Pacific (2 PM to 5 PM London). The most popular slot is 8 AM PST / 4 PM London.
PST vs UK time explained
Pacific Standard Time (PST) is UTC-8. It is observed on the US West Coast 鈥?California, Oregon, Washington, Nevada, and British Columbia 鈥?from the first Sunday in November to the second Sunday in March.
Greenwich Mean Time (GMT) is UTC+0. It is the UK's winter time zone, observed from the last Sunday in October to the last Sunday in March.
The difference in winter: London is 8 hours ahead of PST. When it is midnight in Los Angeles, it is 8 AM in London.
In summer, both zones shift forward by one hour: PST becomes PDT (UTC-7) and GMT becomes BST (UTC+1). Because both shift by the same amount, the 8-hour gap is maintained. The result: London is always 8 hours ahead of Pacific time for the vast majority of the year.
The transition weeks exception
There are two short windows each year when the gap temporarily changes:
- Late March: The US switches to PDT before the UK switches to BST (by about one week). During this week, the gap is temporarily 7 hours.
- Late October: The UK switches back to GMT before the US reverts to PST. During this week, the gap is temporarily 9 hours.
For calls scheduled around these dates, always verify using the Meeting Time Finder tool.
Best meeting hours 鈥?PST and London
Standard business hours in both locations:
- London: 9 AM to 5 PM GMT/BST
- Los Angeles / San Francisco: 9 AM to 5 PM PST/PDT
The shared window 鈥?when both cities are in standard business hours 鈥?is 6 AM to 9 AM Pacific (2 PM to 5 PM London).
This is a 3-hour window. It requires the US West Coast side to start early. There is no overlap at all during standard Pacific afternoon hours (after 9 AM Pacific, London has already closed for the day).
Recommended slots
- 8 AM PST / 4 PM London 鈥?most popular; mid-morning Pacific, mid-afternoon London
- 7 AM PST / 3 PM London 鈥?earlier Pacific start; more time for London to act on outcomes
- 9 AM PST / 5 PM London 鈥?latest viable slot; requires London flexibility
Business hours overlap
The table below shows US West Coast times and their London equivalents during standard working hours. Times shown for winter (PST/GMT); summer (PDT/BST) produces the same London clock time because both zones shift together.
| Pacific Time (PST) | London (GMT) | Usable? |
|---|---|---|
| 6:00 AM PST | 2:00 PM GMT | 鉁?Both in hours |
| 7:00 AM PST | 3:00 PM GMT | 鉁?Both in hours |
| 8:00 AM PST | 4:00 PM GMT | 鉁?Most popular slot |
| 9:00 AM PST | 5:00 PM GMT | 鈿?London end of day |
| 10:00 AM PST | 6:00 PM GMT | 鉁?Outside London hours |
| 11:00 AM PST | 7:00 PM GMT | 鉁?Outside London hours |
| 12:00 PM PST | 8:00 PM GMT | 鉁?Outside London hours |
| 1:00 PM PST | 9:00 PM GMT | 鉁?Outside London hours |
| 2:00 PM PST | 10:00 PM GMT | 鉁?Outside London hours |
PST to London conversion table
Full 24-hour conversion for all PST hours. London times shown as GMT (winter) and BST (summer) 鈥?both give the same clock time due to the matching DST shift.
| PST / PDT | GMT / BST (London) | Conversion page |
|---|---|---|
| 7:00 AM | 3:00 PM | 7 AM PST in London |
| 8:00 AM | 4:00 PM | 8 AM PST in London |
| 9:00 AM | 5:00 PM | 9 AM PST in London |
| 10:00 AM | 6:00 PM | 10 AM PST in London |
| 11:00 AM | 7:00 PM | 11 AM PST in London |
| 12:00 PM | 8:00 PM | 12 PM PST in London |
| 1:00 PM | 9:00 PM | 1 PM PST in London |
| 2:00 PM | 10:00 PM | 2 PM PST in London |
Common scheduling mistakes
Forgetting the transition weeks
The US switches to PDT in mid-March; the UK switches to BST about one week later. During that week, the gap is 7 hours, not 8. Your calendar invite may show the wrong London time if it was set up before the transition. Always recheck recurring meetings in late March and late October.
Confusing PST and PDT
PST (Pacific Standard Time, UTC-8) and PDT (Pacific Daylight Time, UTC-7) differ by one hour. If you write "PST" in an invite during summer, the London side may apply the wrong offset. Always write the date and both city names in your invite, not just the timezone abbreviation.
Scheduling after 9 AM Pacific without checking
Anything after 9 AM PST (5 PM London) is outside the UK working day. Teams sometimes schedule a 10 AM Pacific call without realising it puts London at 6 PM. Use the tool below to verify before sending invites.
Not including both local times in calendar invites
Always write both times in the invite title or description 鈥?for example "8 AM PDT / 4 PM BST, 14 July". This avoids confusion when the invite is shared or forwarded across timezones.
Frequently asked questions
How many hours ahead is London compared to PST?
London is 8 hours ahead of Pacific Standard Time (PST) year-round. The 8-hour gap is maintained in summer because both the US West Coast (PST 鈫?PDT) and the UK (GMT 鈫?BST) observe daylight saving time and shift by the same amount.
Does daylight saving time change the PST to UK gap?
No 鈥?both zones observe daylight saving and switch together in spring, keeping the gap at 8 hours. The only exceptions are the brief transition weeks in late March and late October when one zone has switched and the other has not yet.
What is the best time to meet between PST and London?
The best overlap window is 6 AM to 9 AM Pacific (2 PM to 5 PM London). 8 AM PST / 4 PM London is the most commonly used slot. It gives both sides a full working day before and after the call.
What Pacific times are outside London business hours?
Anything after 9 AM PST falls outside the standard UK working day. 10 AM PST is 6 PM London, 11 AM PST is 7 PM London, and noon PST is 8 PM London. After 9 AM Pacific, plan for asynchronous communication with London.
All PST to London conversion pages
7 AM PST in London · 8 AM PST in London · 9 AM PST in London · 10 AM PST in London · 11 AM PST in London · 12 PM PST in London · 1 PM PST in London · 2 PM PST in London · PST to UK Guide · LA to London meeting planner
Related guides and tools
Meeting Time Finder 鈥?free overlap tool · Los Angeles to London meeting planner · San Francisco to London · 8 AM EST in London · 9 AM EST in London · Global team meeting guide