Shanghai is 16 hours ahead of Los Angeles. Shanghai uses China Standard Time (CST, UTC+8) while Los Angeles uses Pacific Time (PST/PDT, UTC-8/-7). When it's 12:00 PM in Los Angeles, it's 4:00 AM the next day in Shanghai.
China does not observe daylight saving time, while Los Angeles does. During US daylight saving time (March to November), the difference is 15 hours.
Best calling time: 9:00 PM - 11:00 PM Shanghai time. This corresponds to 5:00 AM - 7:00 AM (or 6:00 AM - 8:00 AM in summer) in Los Angeles, catching early morning hours.
Shanghai and Los Angeles are both major Pacific Rim cities with strong trade ties. LAX-PVG is one of the busiest transpacific routes, with flights taking about 12-13 hours.