Up until the mid-1500s, all of Europe used the same calendar. In that calendar, April 1st was the first day of the year. On the that day, people exchanged gifts and visited each other. In the year 1564, Charles IX created a new calendar which uses the date January 1st as the new start of the new year. Some didn't like the thought of the change of date for the new year and refused to accept the new traditions. Those who continued to celebrate the start of a New Year on April 1st became the ridicule of their friends and neighbors. These friends and neighbors played tricks on them because the 'April Fools' continued to hold onto their false April New Year's Day.
How We Celebrate It Today
Today we celebrate this holiday by playing tricks on friends and family regardless of which New Year's Day they observe.
Questions?
If you have any questions or further information, please leave a comment. To find out April Fools' tricks please view this site: http://aprilfoolzone.com/