Johannesburg is 1 hour ahead of Hamburg
Best overlap: 8:00 AM to 5:00 PM in Hamburg is 9:00 AM to 6:00 PM in Johannesburg.
The sweet spot is 8:00 AM to 5:00 PM Hamburg time, matching 9:00 AM to 6:00 PM in Johannesburg. With 9 hours in common, treat scheduling almost as if the two cities were in the same region. Because only Hamburg changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Hamburg enters or leaves daylight saving.