Shanghai and Shenzhen are on the same time. Both cities use China Standard Time (CST, UTC+8). When it's 12:00 PM in Shanghai, it's also 12:00 PM in Shenzhen.
China uses a single time zone across the entire country, keeping all major cities synchronized year-round.
Any time works! Since both cities share the same time zone, you can call during normal business hours (9:00 AM - 6:00 PM) without any conversion needed.
Shanghai and Shenzhen are two of China's most important economic centers. Shanghai is the financial capital, while Shenzhen is the tech hub, often called "China's Silicon Valley." High-speed rail connects them in about 6.5 hours, while flights take 2.5 hours.