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Benjiman Franklin created daylight savings to economize the use of candles by making the time earlier in the morning to make a good use of morning sunlight.
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Germany was the first country apply daylight saving to their timezone. Soon after, so did the British.
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When WW1 came, the US used daylight saving to conserve fuel. After the war, the US repealed it until WW2.
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When WW2 came, the US War Time pushed clocks ahead one hour. Britain pushed their clocks ahead two hours. After the war, the US decided to keep daylight saving hours.
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The US adopted daylight savings, so each time zone gets moved back an hour.
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Congress decided to "spring foward" an hour on the first Sunday in April, and fall back an hour the last Sunday in October.
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Congress passed a law to help with saving energy to extend daylight saving for about a month longer than normal.
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Since 2007, daylight saving starts the second Sunday of March and end the first Sunday of November
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