Shanghai is 6 hours ahead of Milan
Best overlap: 8:00 AM to 12:00 PM in Milan is 2:00 PM to 6:00 PM in Shanghai.
Your shared working hours run 8:00 AM to 12:00 PM in Milan (2:00 PM to 6:00 PM in Shanghai). You get roughly 4 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams. Heads up: because Milan changes its clocks and Shanghai doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.