Best overlap: 8:00 AM to 11:00 AM in Edinburgh is 3:00 PM to 6:00 PM in Hanoi.
Keep meetings inside 8:00 AM to 11:00 AM in Edinburgh — that maps to 3:00 PM to 6:00 PM in Hanoi. Around 3 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day. Because Edinburgh and Hanoi don't both observe daylight saving, plan to re-check the overlap around March and November.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Edinburgh Europe/London | ||||||||||||||||||||||||
Hanoi Asia/Ho Chi Minh |
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. -