What is Daylight Saving Time?

Key Facts

• On the first Sunday of November, at 2 a.m., clocks in most of the United States and many other countries turn back an hour and stay there for nearly four months on what is called standard time.
• On the second Sunday of March, at 2 a.m., clocks move forward one hour back to Daylight Saving Time.
• Daylight Saving Time has its roots in train schedules, but it was put into practice in Europe and the United States to save fuel and power during World War I by extending daylight hours, according to the US Department of Transportation’s Bureau of Transportation Statistics.
• The twice-yearly switcheroo is irritating enough to lawmakers of all political stripes that the US Senate passed legislation in March to make Daylight Saving Time permanent.

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