Best overlap: 8:00 AM to 3:00 PM in Amsterdam is 11:30 AM to 6:30 PM in Colombo.
For the smoothest call, aim inside 8:00 AM to 3:00 PM in Amsterdam, i.e. 11:30 AM to 6:30 PM in Colombo. That's a roomy 7 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Daylight saving complicates things slightly: Amsterdam observes it, Colombo doesn't, so the difference flexes by an hour part of the 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Amsterdam Europe/Amsterdam | ||||||||||||||||||||||||
Colombo Asia/Colombo |
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. -