San Diego is 14 hours behind Hanoi

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

With 14 hours between them, Hanoi and San Diego have no overlap during standard business hours — by the time one team logs on, the other has logged off. The usual fix is an early start for San Diego or a late finish for Hanoi — pick whichever team has more flexibility. A quick caveat — San Diego's clocks move for daylight saving and Hanoi's don't, so the times here are right for only part of the year.