Quick answer
10 AM PST is 6 PM GMT in London (winter). In summer, 10 AM PDT is 6 PM BST. This is one hour past the standard UK end of working day. London participants joining at 6 PM are attending outside their contracted hours. This slot requires explicit acknowledgement and should not be treated as a default.
What 10 AM PST / 6 PM London actually means
When a San Francisco or Los Angeles team books a 10 AM Pacific meeting and includes London participants without checking the UK time, the London team receives a 6 PM calendar invite. Most UK professionals finish their working day at 5 PM. A 6 PM meeting is not "slightly late" — it is outside standard contracted working hours. Attendees joining at 6 PM are giving their personal evening time to a work meeting.
This distinction matters because recurring meetings at 10 AM Pacific / 6 PM London accumulate as overtime. Over weeks and months, a standing weekly call at this slot becomes a morale and retention risk for the London team. The Pacific team, working at a comfortable 10 AM, may not notice the asymmetry until attrition or feedback makes it explicit.
When this slot is used and when it should not be
Legitimate uses: One-off calls where the London participant has explicitly agreed to the 6 PM time. Calls where the London participant is in a UK-facing role for a US company and the 6 PM expectation is part of their established working arrangement. Emergency or high-priority discussions where no earlier slot is available and the matter is genuinely urgent.
Problematic uses: Recurring weekly syncs booked at 10 AM Pacific without verifying the London time. Any meeting where the Pacific organiser assumes "10 AM is early enough" without checking. Calls that push past 60 minutes, taking London to 7 PM or beyond.
The Pacific organiser's blind spot
10 AM Pacific is a comfortable, productive hour. It sits after the morning rush and before the midday lull — a genuinely good time for Pacific participants to hold meetings. This comfort can obscure the fact that a 10 AM Pacific invite creates a 6 PM London reality for colleagues. The correction is straightforward: before scheduling any Pacific morning meeting with London participants, check the London landing time. The SF–London planner and LA–London planner show which Pacific hours are within London's working window.
Scheduling advantages
- 10 AM Pacific is one of the best meeting times for West Coast participants — focused, unhurried, mid-morning
- Works for London-based participants who have explicitly agreed to a shifted schedule (e.g., US-facing roles starting later)
- Suitable for emergency calls where the topic is urgent and all parties understand it is outside normal hours
Scheduling drawbacks
- London participants are one hour past their contracted working day — this is overtime, not a minor inconvenience
- As a recurring weekly meeting, it is a morale and retention risk for the London team over time
- Difficult to staff: London participants with childcare, commutes, or evening commitments cannot reliably attend at 6 PM
- Any overrun pushes London further into their personal evening
Alternatives
If the Pacific team cannot start earlier than 10 AM, consider asynchronous alternatives for London participants: record the meeting, share a structured summary within one hour of the call ending, and allow London to respond asynchronously the next morning. For decisions that must involve London in real time, shift the Pacific meeting time to 8 AM (4 PM London — within hours) or 7 AM (3 PM London — comfortable for both sides). The asymmetry of one-hour earlier for Pacific versus one hour inside vs outside working day for London makes early Pacific starts a fair trade.
What is 10 AM PST in London?
10 AM PST is 6 PM GMT in London during winter. In summer, 10 AM PDT is 6 PM BST. This is one hour past the standard UK end of working day. London participants attending this call are joining outside standard contracted hours.
Is 10 AM Pacific a reasonable time for a London meeting?
Not as a default or recurring slot. 10 AM Pacific reaches London at 6 PM, which is outside the standard UK working day. It is reasonable only when the London participant has explicitly agreed to this time as part of their role or the call is a genuine exception. As a standing recurring meeting without explicit London agreement, it creates ongoing overtime for the UK team.
What should I do if I need a meeting that works for both 10 AM Pacific and London?
The two options are: (1) shift the Pacific time earlier — 8 AM Pacific gives London 4 PM, one full hour within the UK working day; or (2) move London participants to an async model — they receive a structured meeting summary the same day and respond the next morning. Option 1 is better for decisions requiring real-time London input. Option 2 is better when London's role is review and feedback rather than live decision-making.
How does DST affect 10 AM PST in London?
The result stays at 6 PM London for most of the year, because both the US West Coast and UK observe daylight saving time together. The brief exception windows in late March and late October temporarily shift it to 5 PM or 7 PM London. Check specific dates for calls in those transition periods.