Ever wonder how this day came about??? Here ya go!
There are several theories regarding the origin of April Fools' Day, and none of them are 100% definitive. However, one does stand above the rest: The Museum of Hoaxes explains that in 1564, King Charles IX of France passed a law that changed the beginning of the year from April 1 to January 1.
News of the change traveled slowly. Those who were either misinformed or slow to make the adjustments still celebrated the New Year on April 1. As a result, they were mocked and pranks were pulled.