Chennai is 2.5 hours ahead of Athens
Best overlap: 8:00 AM to 4:00 PM in Athens is 10:30 AM to 6:30 PM in Chennai.
Aim for 8:00 AM to 4:00 PM Athens time — that's 10:30 AM to 6:30 PM over in Chennai. Chennai is 2.5 hours ahead of Athens, but the generous 8-hour window means both teams can meet well within their normal day. Finally, Athens observes daylight saving and Chennai doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.