Rome 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 Rome.
Your window to reach both cities is 2:00 PM to 6:00 PM in Shanghai, which converts to 8:00 AM to 12:00 PM in Rome. Roughly 4 hours of shared hours means scheduling takes a little care — 2:00 PM in Shanghai / 8:00 AM in Rome is a safe default. One seasonal catch: Rome springs forward and falls back, but Shanghai doesn't, so the gap changes by an hour for several months of the year.