There is no time difference between Guangzhou and Shanghai. Both cities use China Standard Time (CST, UTC+8). When it's 12:00 PM in Guangzhou, it's also 12:00 PM in Shanghai.
China uses a single timezone across the entire country, so all major cities remain synchronized.
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.
Guangzhou and Shanghai are two of China's largest cities. Guangzhou is the capital of Guangdong province and a major manufacturing hub, while Shanghai is China's financial center. High-speed rail connects them in about 8 hours.