Chennai is 3.5 hours ahead of Copenhagen
Best overlap: 8:00 AM to 3:00 PM in Copenhagen is 11:30 AM to 6:30 PM in Chennai.
The overlap falls at 8:00 AM to 3:00 PM in Copenhagen, or 11:30 AM to 6:30 PM if you're in Chennai. The 3.5-hour gap barely gets in the way — you've got 7 hours of overlap, so pick whatever time fits the agenda. Heads up: because Copenhagen changes its clocks and Chennai doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.