Best overlap: 3:00 PM to 6:00 PM in Hanoi is 8:00 AM to 11:00 AM in Edinburgh.
Keep meetings inside 3:00 PM to 6:00 PM in Hanoi — that maps to 8:00 AM to 11:00 AM in Edinburgh. Edinburgh is 7 hours behind Hanoi, which gives you a solid 3-hour window. Book earlier in it and neither side is rushing. Keep an eye on the calendar — Edinburgh observes daylight saving and Hanoi doesn't, which nudges this window by an hour twice a year.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
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Hanoi Asia/Ho Chi Minh | ||||||||||||||||||||||||
Edinburgh Europe/London |
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -