Philadelphia is 11 hours behind Hanoi

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

Hanoi and Philadelphia are too far apart in time (11 hours) for their workdays to line up during regular hours. For anything urgent, agree on an early-morning or late-night bridge hour in advance so nobody's caught off guard. Because only Philadelphia changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Philadelphia enters or leaves daylight saving.