Tehran is 8.5 hours behind Wellington

Best overlap: 5:00 PM to 6:00 PM in Wellington is 8:30 AM to 9:30 AM in Tehran.

For a call that suits both sides, look at 5:00 PM to 6:00 PM in Wellington / 8:30 AM to 9:30 AM in Tehran. Since Tehran is 8.5 hours behind Wellington, the overlap is narrow (about 1 hour); a single, well-protected slot beats hunting for time each week. These times hold for most of the year, but Wellington's daylight saving (which Tehran doesn't use) shifts them by an hour twice annually.