Honolulu is 18 hours behind Shanghai
Best overlap: 8:00 AM to 12:00 PM in Shanghai is 2:00 PM to 6:00 PM in Honolulu.
For a call that suits both sides, look at 8:00 AM to 12:00 PM in Shanghai / 2:00 PM to 6:00 PM in Honolulu. With 4 hours of overlap, 8:00 AM in Shanghai (2:00 PM in Honolulu) is a comfortable, repeatable slot for both sides. Heads up on dates: Honolulu will show the previous day relative to Shanghai when you meet.