Hamburg 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 Hamburg.
Keep meetings inside 8:00 AM to 12:00 PM in Atlanta — that maps to 2:00 PM to 6:00 PM in Hamburg. With 4 hours of overlap, 8:00 AM in Atlanta (2:00 PM in Hamburg) is a comfortable, repeatable slot for both sides.