Tehran is 1.5 hours ahead of Stockholm
Best overlap: 8:00 AM to 5:00 PM in Stockholm is 9:30 AM to 6:30 PM in Tehran.
Both offices are open during 8:00 AM to 5:00 PM Stockholm time, which is 9:30 AM to 6:30 PM in Tehran. With 9 hours in common, treat scheduling almost as if the two cities were in the same region. Watch the DST gap — when Stockholm changes its clocks and Tehran stays the same, this window slides by an hour.