Best overlap: 8:30 AM to 1:30 PM in Tehran is 1:00 PM to 6:00 PM in Perth.
Aim for 8:30 AM to 1:30 PM Tehran time — that's 1:00 PM to 6:00 PM over in Perth. Perth is 4.5 hours ahead of Tehran, leaving about 5 hours of daily overlap — enough for most meetings if you don't leave them too late in the day.
| 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 | ||||||||||||||||||||||||
Perth Australia/Perth |
The US to Australia gap runs 14 to 19 hours depending on the month, and someone is always in tomorrow. Exact overlap windows for every US coast, the double-DST trap, and a rotation rule that keeps it fair. -