Best overlap: 12:30 PM to 6:30 PM in Colombo is 8:00 AM to 2:00 PM in London.
For the smoothest call, aim inside 12:30 PM to 6:30 PM in Colombo, i.e. 8:00 AM to 2:00 PM in London. London is 4.5 hours behind Colombo, but you'd hardly notice — 6 hours of shared hours makes this feel like working in neighbouring time zones. For part of the year the maths changes: London observes daylight saving, Colombo does not, shifting the overlap by an hour.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Colombo Asia/Colombo | ||||||||||||||||||||||||
London Europe/London |
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