Shenzhen is 7 hours ahead of Geneva
Best overlap: 8:00 AM to 11:00 AM in Geneva is 3:00 PM to 6:00 PM in Shenzhen.
Keep meetings inside 8:00 AM to 11:00 AM in Geneva — that maps to 3:00 PM to 6:00 PM in Shenzhen. Shenzhen is 7 hours ahead of Geneva, leaving about 3 hours of daily overlap — enough for most meetings if you don't leave them too late in the day. Finally, Geneva observes daylight saving and Shenzhen doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.