Best overlap: 8:00 AM to 1:00 PM in Edinburgh is 1:00 PM to 6:00 PM in Karachi.
For the smoothest call, aim inside 8:00 AM to 1:00 PM in Edinburgh, i.e. 1:00 PM to 6:00 PM in Karachi. A 5-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Seasonal note: Edinburgh uses daylight saving and Karachi doesn't, so double-check the times in your own months — they can move 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Edinburgh Europe/London | ||||||||||||||||||||||||
Karachi Asia/Karachi |
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. -