The US is already on PDT while London is still on GMT. A Pacific meeting may land one hour earlier in London than teams expect.
Quick answer
PST to London is usually an 8-hour time difference
PST to London means converting Pacific Standard Time on the US West Coast to the local time in London. In normal winter time, London is 8 hours ahead of PST, so 8 AM PST is 4 PM in London.
For scheduling, this is more than a clock conversion: the useful meeting window is early Pacific morning and London afternoon, when both sides are still inside working hours.
PST to London
+8 hours
8 AM Pacific becomes 4 PM London, the safest common meeting slot for US West Coast and UK teams.
Common PST to London conversions
| Pacific time | London time | Meeting guidance |
|---|---|---|
| 8 AM PST | 4 PM London | Best common meeting slot for West Coast and London teams. |
| 9 AM PST | 5 PM London | Last reasonable London work-hour slot; keep it short. |
| 10 AM PST | 6 PM London | Usually after hours in London; use only if agreed. |
| 1 PM PST | 9 PM London | Avoid for live meetings unless it is exceptional. |
| 5 PM PST | 1 AM London next day | Avoid for normal work calls. |
Key facts
London is always 8 hours ahead of Pacific time. PST (UTC-8) in winter and PDT (UTC-7) in summer - both map to an 8-hour London lead because the UK also shifts clocks in spring (GMT → BST). The gap is stable year-round except during the brief transition weeks in late March and late October.
The working-hours overlap window is 6 AM to 9 AM Pacific (2 PM to 5 PM London). Outside this window, one side is outside business hours.
Understanding the gap: PST, PDT, GMT, and BST
The US West Coast observes two time zones across the year:
- PST - Pacific Standard Time (UTC-8): First Sunday of November to second Sunday of March
- PDT - Pacific Daylight Time (UTC-7): Second Sunday of March to first Sunday of November
London also shifts twice per year:
- GMT - Greenwich Mean Time (UTC+0): Last Sunday of October to last Sunday of March
- BST - British Summer Time (UTC+1): Last Sunday of March to last Sunday of October
Because both zones shift by one hour in the same direction in spring, the gap stays at 8 hours throughout the year. PST (UTC-8) and GMT (UTC+0): 8 hours. PDT (UTC-7) and BST (UTC+1): also 8 hours. The arithmetic works out identically.
The transition-week exception
The US switches to PDT in mid-March; the UK switches to BST about a week later. During that week, the gap is temporarily 7 hours (PDT + GMT). In late October, the UK reverts to GMT before the US reverts to PST, creating a temporary 9-hour gap. For calls scheduled in these windows, always verify using the tool on this page or the Meeting Time Finder.
When PST to London can be wrong by one hour
Most of the year, Pacific time and London stay 8 hours apart. The risk appears during the short weeks when the US and UK change clocks on different dates. These are the weeks when a recurring Pacific-to-London meeting can quietly shift by one hour in London.
London has returned to GMT while the US is still on PDT. A Pacific meeting may land one hour later in London than usual.
Use America/Los_Angeles and Europe/London in calendar invites instead of typing PST or GMT manually.
If your call falls inside these transition windows, recheck the date before sending a recurring invite. The safest Pacific-to-London meeting window is still early Pacific morning, but the exact London result can shift during these DST risk weeks.
Best PST to London meeting times
Standard business hours are 9 AM to 5 PM in both locations. The overlap window where both cities are within those hours:
Best overlap window
6:00 AM-9:00 AM Pacific
2:00 PM-5:00 PM London. A 3-hour window that requires an early Pacific start but keeps London comfortably inside the working day.
The most balanced slot. Pacific starts early, London still has time to act after the call.
Works for short calls, but it is the edge of London business hours.
London is after hours. Use only when everyone has explicitly agreed.
Hour-by-hour PST to London conversion
All hours shown as PST/PDT → GMT/BST. London times are identical in both seasons because the zones shift together.
| PST / PDT | London GMT / BST | Within UK hours? | Page |
|---|---|---|---|
| 6:00 AM | 2:00 PM | Yes | 6 AM PST |
| 7:00 AM | 3:00 PM | Yes | 7 AM PST |
| 8:00 AM | 4:00 PM | Yes - Most popular | 8 AM PST |
| 9:00 AM | 5:00 PM | End of day | 9 AM PST |
| 10:00 AM | 6:00 PM | No | 10 AM PST |
| 11:00 AM | 7:00 PM | No | 11 AM PST |
| 12:00 PM | 8:00 PM | No | 12 PM PST |
| 1:00 PM | 9:00 PM | No | 1 PM PST |
| 2:00 PM | 10:00 PM | No | 2 PM PST |
| 3:00 PM | 11:00 PM | No | 3 PM PST |
| 4:00 PM | 12:00 AM | No | 4 PM PST |
| 5:00 PM | 1:00 AM | No | 5 PM PST |
Common scheduling mistakes - PST and London
Booking a 10 AM Pacific call without checking
10 AM PST is 6 PM London - after working hours. Teams frequently book these by mistake because 10 AM feels like a reasonable morning start. Always verify the London time before sending any calendar invite.
Not adjusting for the transition weeks
In late March and late October, the US and UK switch clocks on different dates. A recurring 8 AM PST meeting may temporarily show a different London time on those weeks. Build a calendar reminder to recheck recurring meetings around the last Sunday of March and the last Sunday of October.
Writing PST in summer invites
From March to November, the US West Coast is on PDT, not PST. Writing "PST" in a summer invite can confuse recipients who apply the wrong offset. Always write the full date alongside both city times: "8 AM PDT / 4 PM BST, 14 August".
Expecting London to be flexible after 9 AM Pacific
After 9 AM PST, London is past 5 PM. While some global teams agree to occasional late calls, making this a recurring expectation without explicit agreement will cause friction. Rotate the burden or use asynchronous workflows for anything after the 9 AM PST cut-off.
Frequently asked questions
How many hours ahead is London from PST?
London is usually 8 hours ahead of Pacific time. The gap is stable for most of the year, but it can briefly become 7 hours in late March and 9 hours in late October when the US and UK change clocks on different dates.
Does the PST to London gap change in summer?
No - both zones shift forward by one hour in spring, maintaining the 8-hour difference. The only exceptions are the brief windows in late March and late October when one zone has switched and the other has not yet.
What is 8 AM PST in London?
8 AM PST is 4 PM GMT (winter) or 4 PM BST (summer) in London. This is the most commonly scheduled Pacific-to-London meeting slot.
What PST times fall outside London business hours?
Any Pacific time after 9 AM PST falls outside the standard UK working day. 10 AM PST is 6 PM London, and each hour after that moves further into the UK evening.
All PST to London conversion pages
Times to avoid
10 AM PST and later should be treated as London after-hours. 1 PM PST is 9 PM in London, and 5 PM PST is 1 AM the next day, so these times are poor choices for live work meetings unless everyone has explicitly agreed.
10 AM PST6 PM London - after the normal workday.
1 PM PST9 PM London - too late for recurring live calls.
5 PM PST1 AM London next day - use async instead.
If the Pacific team needs an afternoon slot, move the discussion to async updates or use the meeting decision tool to find a fairer rotating window.
Need to schedule, not just convert?
Need to schedule a meeting instead of just converting time? Find the best meeting window.