Milan is 6 hours behind Shanghai
Best overlap: 2:00 PM to 6:00 PM in Shanghai is 8:00 AM to 12:00 PM in Milan.
2:00 PM to 6:00 PM in Shanghai is when Milan is also working, at 8:00 AM to 12:00 PM their time. Roughly 4 hours of common time means scheduling is manageable; just avoid the very edges of the window. Because only Milan changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Milan enters or leaves daylight saving.