Tehran is 1.5 hours ahead of Bucharest
Best overlap: 8:30 AM to 4:30 PM in Bucharest is 10:00 AM to 6:00 PM in Tehran.
Keep meetings inside 8:30 AM to 4:30 PM in Bucharest — that maps to 10:00 AM to 6:00 PM in Tehran. Tehran is 1.5 hours ahead of Bucharest, but you still share a generous 8 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to. Keep an eye on the calendar — Bucharest observes daylight saving and Tehran doesn't, which nudges this window by an hour twice a year.