US East Coast teams coordinating with London offices need to plan around the afternoon handoff. By the time New York finishes lunch, London is wrapping up for the day. This matters for media companies, consulting firms, and any business with transatlantic clients.
Add 5 hours to Eastern Time to get London time in most of the year. A 10 AM meeting in New York is 3 PM in London. An end-of-day 5 PM in New York is already 10 PM in London, well outside working hours.
The tricky weeks come in March and October/November. Because the US and UK switch to daylight saving on different Sundays, there are roughly two weeks in spring and one week in autumn where the gap is only 4 hours. Mark those transition weekends on your calendar if precise scheduling matters.
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