April Fool's Day began in france more than 400 years ago. before then ,people celebrated the new year on 1 April. Then in 1582 the French king,Charles IX ,changed the calendar.He moved the beginning of the year from 1 April to 1 January.After this,anyone who celebrated the new year on 1 April was called an 'April fool'.People played jokes on these 'Apeil fools'.