Colombo is 11.5 hours ahead of Calgary

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

Calgary and Colombo have no natural overlap. The 11.5-hour gap is simply too large for regular working hours to meet. Treat the handoff like a relay — Calgary wraps up and leaves notes for Colombo to pick up as their day begins. A quick caveat — Calgary's clocks move for daylight saving and Colombo's don't, so the times here are right for only part of the year.