Best overlap: 8:30 AM to 2:30 PM in Manchester is 12:00 PM to 6:00 PM in Tehran.
Your shared working hours run 8:30 AM to 2:30 PM in Manchester (12:00 PM to 6:00 PM in Tehran). Tehran is 3.5 hours ahead of Manchester, and with 6 hours of overlap you can even run back-to-back calls without stepping outside business hours. Watch the DST gap — when Manchester changes its clocks and Tehran stays the same, this window slides 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Manchester Europe/London | ||||||||||||||||||||||||
Tehran Asia/Tehran |
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. -