There is no time difference between Shenzhen and Shanghai. Both cities use China Standard Time (CST, UTC+8). When it's 12:00 PM in Shenzhen, it's also 12:00 PM in Shanghai.
China uses a single timezone across the entire country, so all major cities remain synchronized year-round. China does not observe daylight saving time.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 6:00 PM) without any time conversion needed.
Shenzhen and Shanghai are two of China's most important economic centers. Shenzhen is the tech and manufacturing hub in the south, while Shanghai is the financial capital in the east. High-speed trains connect them in about 8 hours, while flights take about 2.5 hours.