April Fool’s Day, sometimes called All Fool's Day, is on the first of April every year. People can play practical jokes. That's why you shouldn't believe what is said to you and you should be doubtful of the people around you on this day. Someone might change the time on another person's alarm to make him wake up very early or very late. Or she / he may put a lot of pepper in another's food.
According to popular lore, some folks, out of ignorance, stubbornness, or both, continued to ring in the New Year on April first and were made the butt of jokes and pranks on account of their foolishness. This became an annual tradition which ultimately spread throughout Europe and other parts of the world.