Stockholm is 7 hours behind Shenzhen
Best overlap: 3:00 PM to 6:00 PM in Shenzhen is 8:00 AM to 11:00 AM in Stockholm.
Keep meetings inside 3:00 PM to 6:00 PM in Shenzhen — that maps to 8:00 AM to 11:00 AM in Stockholm. With 3 hours of overlap, 3:00 PM in Shenzhen (8:00 AM in Stockholm) is a comfortable, repeatable slot for both sides. Finally, Stockholm observes daylight saving and Shenzhen doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.