4am in British Summer Time is 11pm in Eastern Standard Time on the previous day.

Frequently asked

Quick answers about converting between British Summer Time and Eastern Standard Time. Can't find what you need? Email [email protected].

What is the time difference between British Summer Time and Eastern Standard Time?

British Summer Time is 5 hours ahead of Eastern Standard Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 4am in British Summer Time, what time is it in Eastern Standard Time?

4am in British Summer Time is 11pm in Eastern Standard Time on the previous day. It lands deep outside working hours in Eastern Standard Time — see the best time to meet below for a friendlier slot. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between British Summer Time and Eastern Standard Time?

2pm–5pm in British Summer Time lines up with 9am–12pm in Eastern Standard Time — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — BST and EDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.