Philadelphia is 12 hours behind Beijing

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

The 12-hour difference means Beijing and Philadelphia miss each other entirely during regular office hours. Where you can, lean on async updates and save live calls for when one team is happy to start early or stay late. For part of the year the maths changes: Philadelphia observes daylight saving, Beijing does not, shifting the overlap by an hour.