system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does China have only one time zone and how do they function with only one time zone?
gpt
They have one time zone because the government says they have one time zone. Specifically, the Communist government made the change in 1949 after the Civil War.

It means that in the far west of China the sun doesn't reach its highest point in the sky until 3pm. In December the sun doesn't rise until after 10am and in June it doesn't set until after 10pm. Those sunrise and sunset times aren't that remarkable compared to places in higher latitudes, though, and people manage to function in Oslo.