Timezones are useful because they let us answer the question "what point in the day is it at <location>." People's schedules are more or less aligned around local sunrise and sunset so knowing what time of day it is at a location important when communicating with people in that location. See https://qntm.org/abolishChina already tried getting rid of time zones, and even though it's only 5 time zones wide it caused enough issues that far western provinces use their own unofficial local time: http://www.theatlantic.com/china/archive/2013/11/china-only-...
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