Stockholm is 1.5 hours behind Tehran
Best overlap: 9:30 AM to 6:30 PM in Tehran is 8:00 AM to 5:00 PM in Stockholm.
The hours that work for both Tehran and Stockholm are 9:30 AM to 6:30 PM (Tehran) and 8:00 AM to 5:00 PM (Stockholm). Plenty of room to work with: 9 hours of daily overlap means you can prioritise people's preferences over the clock. One seasonal catch: Stockholm springs forward and falls back, but Tehran doesn't, so the gap changes by an hour for several months of the year.