Geneva is 6 hours ahead of Atlanta
Best overlap: 8:00 AM to 12:00 PM in Atlanta is 2:00 PM to 6:00 PM in Geneva.
Shoot for 8:00 AM to 12:00 PM in Atlanta; your Geneva colleagues will see that as 2:00 PM to 6:00 PM. Geneva is 6 hours ahead of Atlanta, so you've got a workable 4-hour overlap — ideal for a standing meeting around 8:00 AM in Atlanta (2:00 PM in Geneva).