There is no time difference between Zurich and Geneva. Both cities use Central European Time (CET/CEST, UTC+1/+2). When it's 12:00 PM in Zurich, it's also 12:00 PM in Geneva.
Both cities observe daylight saving time on the same schedule, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Zurich and Geneva are Switzerland's two largest cities and major global financial centers. They're connected by frequent trains taking about 2.5 hours. Zurich is the German-speaking commercial hub, while Geneva is the French-speaking home to many international organizations including the UN and WHO.