Best overlap: 12:00 PM to 6:00 PM in Tehran is 8:30 AM to 2:30 PM in Edinburgh.
Tehran and Edinburgh overlap from 12:00 PM to 6:00 PM (Tehran) to the equivalent 8:30 AM to 2:30 PM in Edinburgh — that's your meeting window. Plenty of room to work with: 6 hours of daily overlap means you can prioritise people's preferences over the clock. One seasonal catch: Edinburgh springs forward and falls back, but Tehran doesn't, so the gap changes by an hour for several months 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Tehran Asia/Tehran | ||||||||||||||||||||||||
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. -