Because of WW1 era Germany. The idea was that moving the clock saves electricity for the war effort. Today it’s disputed if it actually does so, but even if it saves electricity those savings are essentially meaningless. More and more countries abandon dst. The reason it’s still here is basically most people are used to it, and there are always more important things to take care of. There were real talks about stopping the clock switching in the EU in 2019 but then Covid hit…
It was invented so we would use less candles. I believe Ben Franklin has a paper about how much the average Frenchman saved by adjusting the time.
Why we still have it? Most of the US is heavily affected by the shortening of days in winter and the lengthening of them in summer. So we want more time in the light in summer and winter, just different parts of the days.
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