There is no time difference between Guangzhou and Hong Kong. Both cities use UTC+8 - Guangzhou uses China Standard Time (CST) and Hong Kong uses Hong Kong Time (HKT). When it's 9:00 AM in Guangzhou, it's also 9:00 AM in Hong Kong.
Neither city observes daylight saving time, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 5:00 PM) without any time conversion needed.
Guangzhou and Hong Kong are neighboring cities in the Pearl River Delta region, connected by high-speed rail in about 50 minutes. Together with Shenzhen, they form one of the world's largest metropolitan areas.