Vienna 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 Vienna.
Both offices are open during 3:00 PM to 6:00 PM Shenzhen time, which is 8:00 AM to 11:00 AM in Vienna. Vienna is 7 hours behind Shenzhen. That leaves about 3 hours of common time — enough for a meeting or two, so use it deliberately. The window above shifts seasonally: Vienna keeps daylight saving while Shenzhen ignores it.