Dhaka is 5 hours ahead of Geneva
Best overlap: 8:00 AM to 1:00 PM in Geneva is 1:00 PM to 6:00 PM in Dhaka.
For the smoothest call, aim inside 8:00 AM to 1:00 PM in Geneva, i.e. 1:00 PM to 6:00 PM in Dhaka. A 5-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Note that Geneva follows daylight saving while Dhaka stays put, so the times above drift by an hour seasonally.