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WATCH: The weird history behind daylight saving time

Posted at 12:03 PM, Oct 31, 2017

This weekend, most Americans will "fall back" -- turning their clocks back one hour and marking the end of daylight saving time.

Every state except for Arizona and Hawaii, that is. 

No state is required to participate in daylight saving time, but the Uniform Time Act of 1966 set a specific time and date to change the clocks. As of August 2005, most of the country springs forward the second Sunday in March and falls back the first Sunday in November.

Beginning on Sunday at 2 a.m., the clocks will return to standard time, and it'll appear the sun is setting an hour earlier. That means you should set your clocks back one hour when you go to bed Saturday night.

The idea of changing the clocks twice a year first came about to provide more daylight during the evening hours and was eventually implemented as a way to try and conserve energy.

Since then, studies have gone back and forth as to whether any more or less energy is used.

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