Best overlap: 9:30 AM to 6:30 PM in Tehran is 8:00 AM to 5:00 PM in Paris.
If you set up a recurring sync, 9:30 AM to 6:30 PM in Tehran (8:00 AM to 5:00 PM in Paris) is the natural home for it. Despite the 1.5-hour difference, a 9-hour overlap keeps things simple and gives both teams breathing room. Keep an eye on the calendar — Paris observes daylight saving and Tehran doesn't, which nudges this window by an hour twice a 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 | ||||||||||||||||||||||||
Paris Europe/Paris |
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. -
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