Chennai is 3.5 hours ahead of Brussels
Best overlap: 8:00 AM to 3:00 PM in Brussels is 11:30 AM to 6:30 PM in Chennai.
For a call that suits both sides, look at 8:00 AM to 3:00 PM in Brussels / 11:30 AM to 6:30 PM in Chennai. Because you share 7 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map. These times hold for most of the year, but Brussels's daylight saving (which Chennai doesn't use) shifts them by an hour twice annually.