9 p.m. ET: Donald Trump and Hillary Clinton participate in the first presidential debate at Hofstra University in Hempstead, New York. Lester Holt, anchor of NBC Nightly News, will moderate the event.
Daylight saving time begins this weekend. What's behind the tradition of pushing our clocks ahead each spring and setting them back each autumn?
Contrary to popular belief, no federal rule mandates that states or territories observe daylight saving time.
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