Shanghai is 6 hours ahead of Stockholm
Best overlap: 8:00 AM to 12:00 PM in Stockholm is 2:00 PM to 6:00 PM in Shanghai.
For the smoothest call, aim inside 8:00 AM to 12:00 PM in Stockholm, i.e. 2:00 PM to 6:00 PM in Shanghai. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Don't be caught out by clock changes — Stockholm observes daylight saving and Shanghai doesn't, so the offset varies by an hour through the year.