This is to clarify my previous post regarding the history of April Mop:
April Mop Merupakan Perayaan Pembataian Umat Islam, Tak Pantas Dirayakan
I’ve read another source and it told that that story was not true if we consider some facts. And the following was the clearest one:
…let us consider the historic fact that Muslim Spain ended on the 12th of January in the Christian year of 1492 A.D. yet ‘April Fool’s Day was not heard of until over fifty years later. Once upon a time, back in 16th-century France, before computers, people celebrated New Year’s Day on March 25, the advent of spring. It was a festive time. They partied steadily until April 1. In 1564, when the calendar reformed and became Gregorian, under the influence of Pope Gregory, King Charles IX proclaimed, perhaps pompously, that New Year’s Day should be celebrated on January 1st instead of in the spring. Diehard conservatives resisted the change (or perhaps didn’t hear about it due to the absence of e-mail) and continued to celebrate New Year’s from March 25 to April 1. During this period of spring festivity, the more flexible French mocked the rigid revelers by sending them foolish gifts and invitations to nonexistent parties. The victim of an April Fools’ Day prank was called a “poisson d’avril,” or an “April fish,” because at that time of year, the sun was leaving the zodiacal sign of Pisces. April Fools’ Day hit its stride (avoiding the banana peel) in England in the 18th century, and was brought to colonial America by the English, Scottish, and French.
you can read further explanation here
I do apologize for posting untrue writing, but still you may search for other sources to get clearer perpective. Above all, still we should not take part in april mop, because fooling people is not a justified act.