Chennai is 11.5 hours ahead of Calgary

There is no standard 8-to-6 overlap. Someone joins early or late.

Calgary and Chennai live on different parts of the day. With 11.5 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. Note that Calgary follows daylight saving while Chennai stays put, so the times above drift by an hour seasonally.