Quick answer
9 AM Pacific Time is 5 PM in London. The Pacific–London gap is 8 hours and holds constant through the year because both the US West Coast and the UK observe daylight saving on the same schedule. The result is always 5 PM London regardless of whether PT is currently PST or PDT.
9 AM Pacific to London: what to know
“Pacific time” (PT) is shorthand for the US West Coast time zone, covering both PST (UTC−8, November–March) and PDT (UTC−7, March–November). London switches between GMT (UTC+0) and BST (UTC+1) on a similar schedule. The net result: the gap remains 8 hours for almost the entire year, so 9 AM Pacific always reaches London at 5 PM.
For West Coast to London calls, 9 AM Pacific / 5 PM London is at the edge of UK business hours. The preferred slot for most teams is 8 AM Pacific / 4 PM London, which gives London a comfortable mid-afternoon window. For the full breakdown, see the US to Europe meeting time guide.
What is 9 AM PT in London?
9 AM PT is 5 PM in London, year-round. Pacific Time covers both PST (UTC−8) in winter and PDT (UTC−7) in summer. London uses GMT in winter and BST in summer. The 8-hour gap is maintained because both regions change clocks simultaneously.
Does 9 AM PT always equal 5 PM London?
Yes, for almost all of the year. There are brief transition windows in spring and autumn (around 1–3 weeks) when the US and UK change clocks on different dates, temporarily shifting the gap by one hour. The Meeting Time Finder accounts for this automatically.
Is 9 AM Pacific a good time for a London call?
It lands at the very end of the UK working day (5 PM London). It is acceptable for a brief call with flexible London teams, but 8 AM Pacific (4 PM London) is more considerate of UK working hours.
What is PT — PST or PDT?
PT stands for Pacific Time, the generic name for the US West Coast zone. It switches between PST (UTC−8) in winter and PDT (UTC−7) in summer. For London conversions, the result is the same — always 5 PM — regardless of which is currently active.