Quick answer
1 PM EST is 6 PM GMT in London (winter). During US daylight saving (EDT), 1 PM EDT is 5 PM BST. Both results are at or after standard UK business hours — this slot suits teams where London participants accept some evening flexibility.
1 PM Eastern to London: what to know
1 PM Eastern time lands outside the standard US–UK overlap window for most teams. In winter (EST), it reaches London at 6 PM — an hour past close of business. In summer (EDT), it lands at 5 PM BST, which is borderline but usable for short calls. Teams that regularly schedule at this hour typically have London participants who work flexible or extended hours.
If your goal is to reach London during normal working hours, 9–11 AM Eastern is the reliable window. Use the US to Europe guide for the full breakdown, or the Meeting Time Finder to find the current exact overlap.
What is 1 PM EST in London?
1 PM EST is 6 PM GMT in London (winter). During US daylight saving (EDT), 1 PM EDT is 5 PM BST. Both results are at or beyond standard UK close of business.
Is 1 PM ET a usable slot for London calls?
It is borderline. 1 PM EDT = 5 PM BST in summer is acceptable for short calls with flexible London teams. The winter result of 1 PM EST = 6 PM GMT is after standard UK hours.
What is the difference between 1 PM EST and 1 PM EDT for London?
EST (UTC−5) maps to 6 PM GMT in London. EDT (UTC−4) maps to 5 PM BST when the UK is also on summer time. The summer version is one hour more convenient for London.
What is the best ET window for London calls?
The standard overlap is 9 AM–12 PM Eastern / 2–5 PM London. See the US to Europe meeting time guide for the full breakdown.