This morning most of the US went through the dreary routine of setting their clocks back one hour to revert to what is called Standard time, after having set it one hour forward in the spring to create Daylight Savings Time. This biannual routine is inevitably accompanied in the media by various explanations for its origins plus complaints about it and demands that we stop this disruptive practice that seems to produce little benefit.
But I was interested in the case of China. It not only does not do this clock-shifting, the entire country has just one time zone though the normal rules for zones (shifting one hour for every 15o of longitude) would require it to have five of them, two more than the contiguous states of the US. The country time is set by Beijing time which is +8 hours from UTC. This article gives the history of how it came about.
I am not sure how the implications of a one-zone policy work out. Since the daily routine is usually associated with sunrise and sunset, do different regions compensate for the single time by having different times for the daily routine, say the work day that is 9-to-5 in Beijing becoming 11-to-7 in the westernmost regions and 7-to-3 in the easternmost regions? And similarly for school days.