Philadelphia is 12 hours behind Hong Kong

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

There's no shared 9-to-5 between Hong Kong and Philadelphia; at 12 hours apart, one city's workday is the other's evening or night. Your best bet is one team taking an early-morning or late-evening call — alternating who stretches keeps it fair over time. Keep an eye on the calendar — Philadelphia observes daylight saving and Hong Kong doesn't, which nudges this window by an hour twice a year.