All of China is officially on Beijing time, the further west you go the time remains the same. Also there is no daylight savings time in China. Unofficially you will find when you go west the time does change. You need to be clear about flight times and such, since they are all in Beijing time.
You can see a list of cities around the world on the right, they are in order of time. The USA is much earlier than China, Europe a bit earlier and eastern Australia is later.