1st of April

Its fools day becoz,fools also thought they need a day to celebrate and act as celebrities..it ended up in fools day

April Fools' Day or All Fools' Day (sometimes written, incorrectly, with the apostrophe before the s rather than after), though not a holiday in its own right, is a notable day celebrated in many countries on April 1. The day is marked by the commission of hoaxes and other practical jokes of varying sophistication on friends and neighbors, or sending them on fools' errands, the aim of which is to embarrass the gullible. In some countries, April Fools' jokes (also called "April Fools") are only made before midday. It is widely celebrated on the Internet The origin of this custom has been much disputed ... see more details here : http://en.wikipedia.org/wiki/April_Fools_Day