Calgary is 14 hours behind Hong Kong
There is no standard 8-to-6 overlap. Someone joins early or late.
Set against a 14-hour difference, Hong Kong and Calgary run their workdays on completely separate schedules. Block a single recurring off-hours slot that both teams agree on, rather than negotiating a new awkward time every week. For part of the year the maths changes: Calgary observes daylight saving, Hong Kong does not, shifting the overlap by an hour.