Daylight saving time

Definition and stakes

Mark Gurevitz, Knowledge Services Group,  Congressional Research Service Report RS22284 Daylight Saving Time

“ The following states and territories do not observe DST: Arizona, Hawaii, American Samoa, Puerto Rico, and the Virgin Islands. This report will be updated as needed.
Historical Background Daylight Saving Time (DST) is not a new concept. In 1784, when Benjamin Franklin was Minister to France, an idea occurred to him: in that part of the year when the sun rises while most people are still asleep, clocks could be reset to allow an extra hour of daylight during waking hours. He calculated that French shopkeepers could save one million francs per year on candles.
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Source: Wikisource

James Arthur,  Time and Its Measurement

“ Some Chinese and Japanese methods of dividing the day and night are indicated in Fig. 1. The old Japanese method divides the day into six hours and the night also into six, each hour averaging twice as long as ours. In some cases they did this by changing the rate of the clock, and in others by letting the clock run uniformly and changing the hour marks on the dial, but this will come later when we reach Japanese clocks.
It is remarkable that at the present time in England the “saving daylight” agitation is virtually an attempt to go back to this discarded system.
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Source: Gutenberg

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