Calgary is 13 hours behind Hanoi

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

Calgary is 13 hours behind Hanoi, so their typical working days don't line up at all. Plan on one side joining outside normal hours. A recurring slot that trades off between early mornings and late evenings usually works best. Watch the DST gap — when Calgary changes its clocks and Hanoi stays the same, this window slides by an hour.