Delhi is 4.5 hours ahead of Hamburg
Best overlap: 8:30 AM to 1:30 PM in Hamburg is 1:00 PM to 6:00 PM in Delhi.
Both offices are open during 8:30 AM to 1:30 PM Hamburg time, which is 1:00 PM to 6:00 PM in Delhi. You get roughly 5 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams. Just remember Hamburg changes its clocks for daylight saving and Delhi doesn't, so confirm the overlap whenever the seasons turn.