What stared April fools day?

April Fools' Day, celebrated on April 1st, is believed to have originated in Europe during the late 16th century when France switched from the Julian calendar to the Gregorian calendar. Those who continued to celebrate the new year in spring were mocked as "April fools." The tradition of playing pranks and jokes on this day spread over time, becoming popular in various cultures worldwide. Today, it’s a day for light-hearted humor and playful deception.