Shenzhen is 14 hours ahead of Dallas
There is no standard 8-to-6 overlap. Someone joins early or late.
For Dallas and Shenzhen, the standard workday in one city falls outside office hours in the other — that's what 14 hours of distance does. Keep live syncs short and infrequent, and let written updates carry the day-to-day between Dallas and Shenzhen. The window above shifts seasonally: Dallas keeps daylight saving while Shenzhen ignores it.