9am in London is 4am in New York City

When it’s 9am in London, it’s 5am in New York City. New York City is 4 hours behind London. During the weeks when North America and Europe switch clocks on different dates, the gap between London and New York City shifts by an hour temporarily. The best time to schedule calls between the two cities is 1pm to 6pm London time (which is 9am to 2pm in New York City). Deal teams connecting London and New York City tend to schedule calls mid-morning in the earlier city, which lands in early afternoon for the other side. In practice, teams in New York City often take early-morning slots to connect with London during afternoon hours, while the London side tends toward end-of-day availability. Having a standing calendar slot for cross-city calls reduces back-and-forth over scheduling and keeps projects moving efficiently.