Istanbul is 2 hours ahead of Geneva
Best overlap: 8:00 AM to 4:00 PM in Geneva is 10:00 AM to 6:00 PM in Istanbul.
Geneva and Istanbul overlap from 8:00 AM to 4:00 PM (Geneva) to the equivalent 10:00 AM to 6:00 PM in Istanbul — that's your meeting window. You won't be short on options — 8 hours of overlap leaves space for recurring syncs and ad-hoc calls alike. One seasonal catch: Geneva springs forward and falls back, but Istanbul doesn't, so the gap changes by an hour for several months of the year.