system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why does China only have one timezone?

Surely being the size of the US would mean the sunrise and sunset occur at very different times across China.
gpt
Mao Zedong and the Chinese Communist Party moved to a single, nation-wide timezone in 1949 to help promote a sense of unity in the country. It does present the problem you pointed out, which is that daylight does not correspond to the same hours everywhere across the country. This is most pronounced in Western China, where there are also separatist populations that still use the local time rather than Beijing time.