Quick answer
9 AM PDT is 5 PM BST in London. PDT (UTC−7) is the summer version of Pacific time. London uses BST (UTC+1) in summer. The 8-hour gap holds because both the US West Coast and the UK observe daylight saving on the same schedule — the same result as 9 AM PST = 5 PM GMT in winter.
9 AM PDT to London: what to know
PDT (Pacific Daylight Time, UTC−7) is active on the US West Coast from the second Sunday in March through the first Sunday in November. London observes BST (UTC+1) on a very similar schedule. The two offsets shift together, so the Pacific–London gap stays at 8 hours for most of the year. 9 AM PDT = 5 PM BST, just as 9 AM PST = 5 PM GMT in winter.
For West Coast to London calls, 9 AM Pacific is at the edge of the UK workday. The preferred slot is typically 8 AM Pacific / 4 PM London. See the US to Europe guide for the full overlap window.
What is 9 AM PDT in London?
9 AM PDT is 5 PM BST in London. PDT (UTC−7) is the summer version of Pacific time. London observes BST (UTC+1) in summer. The gap is 8 hours — the same as PST to GMT in winter — because both regions observe daylight saving simultaneously.
What is the difference between PDT and PST for London calls?
PDT (UTC−7) applies in US summer; PST (UTC−8) applies in winter. London's BST and GMT switch at almost the same time. The result is that 9 AM Pacific always equals 5 PM London.
When is PDT active?
PDT (Pacific Daylight Time) is active from the second Sunday in March to the first Sunday in November. Outside that window, the US West Coast uses PST (UTC−8).
Is 9 AM PDT a good time for London calls?
It reaches London at 5 PM BST — end of business. Acceptable for a quick call, but 8 AM PDT (4 PM BST) gives London a more comfortable window. Use the Los Angeles to London planner for the full overlap.