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Congress placed the country on Daylight Saving Time for the remainder of WWI to conserve resources for the War. This was observed for seven montljs, and it proved so unpopular it was later repealed.
We went to war again and Congress reinstated D.S.T. on Feb. 2, 1942. Time in the U.S. was advanced one hour to save energy. This remained advanced one hour year-round until Sept. 30, 1945.
There was no law about Daylight Saving Time from 1945 to 1966. State and localities were free to observe D.S.T. or not.
This caused much confusion, especially for the broadcasting industry, trains, and buses because of the different local laws and customs. New schedules had to be made each time a state or town began or ended Daylight Saving Time.
Congress decided to step in and end the confusion and established one pattern across the country.
In 1973 following the Arab oil embargo, Congress put the nation on extended Daylight Saving Time for two years to save additional energy. This worked, but Congress did not continue the experiment mostly because of the farming states.
Farmers would not change their clocks because they worked by sun time.
It was changed many times
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