We look forward to it every year. April Fools' Day -- the one day where millions of people play April Fool pranks on their friends and loved ones. After all, who hasn't passed along a Rickroll video on April 1?
But how did April Fools' Day start and why is April Fools' Day on April 1? History.com tells us that while its true origin remains somewhat of a mystery, historians theorize that the tradition dates back to 1582 when France switched from the Julian calendar to the Gregorian calendar as decreed by the Council of Trent.
Some trace the prank day's origins to 1582 after Pope Gregory XIII ordered the adoption of Gregorian calendar which moved New Year's Day from the end of March to Jan. 1.
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