The current March to November system that the US follows began in 2007, but the concept of “saving daylight” is much older. Pro tip: It’s Daylight Saving Time, with singular use of “saving,” not “savings.”Reasons for Daylight Saving TimeDon't forget to reset your alarm clock. Jasmin Merdan/Moment RF/Getty ImagesThe US kept Daylight Saving Time permanent during most of World War II. Why do we need Daylight Saving TimeStudies over the last 25 years have shown the one-hour change disrupts body rhythms tuned to Earth’s rotation, adding fuel to the debate over whether having Daylight Saving Time in any form is a good idea. Although saving energy was often put out as a reason to have Daylight Saving Time, the energy saved isn’t much — if anything at all.

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Persons: CNN — It’s, ”, Jasmin Merdan, Gallup, Richard Nixon, Florida’s Organizations: CNN, US Department of Transportation’s Bureau of Transportation Statistics, Getty, Studies, Daylight Locations: United States, Europe, ” Hawaii, Arizona, Pacific, Caribbean