Tehran is 2.5 hours ahead of Geneva
Best overlap: 8:30 AM to 3:30 PM in Geneva is 11:00 AM to 6:00 PM in Tehran.
Geneva and Tehran overlap from 8:30 AM to 3:30 PM (Geneva) to the equivalent 11:00 AM to 6:00 PM in Tehran — that's your meeting window. You won't be short on options — 7 hours of overlap leaves space for recurring syncs and ad-hoc calls alike. The difference isn't constant year-round: Geneva adjusts for daylight saving while Tehran holds steady.