It's like the ultimate April Fool's Day joke that's been played every year, for at least the past 100 years. Probably longer. Journalists report that the most probable theory of the origin of April Fool's Day is that the celebration dates back to the late sixteenth century when people in France got confused by the calendar reform that moved the beginning of the year from April 1 to January 1. Those who continued to celebrate the beginning of the year on April 1 had jokes played on them and were called April Fools (or "poisson d'Avril" in French).

This year was no different. For instance, over at the Huffington Post, Alex Leo reported:

Andrea Thompson of LiveScience (in an article featured on the front page of Yahoo) wrote:

It's time to kill this theory off once and for all. In fact, it shouldn't even qualify as a theory. It's just a historical legend. Here are the facts:

• There is no evidence in the historical record to suggest people were mocked for getting confused about the date change. When reporters offer this as a historical fact, they're inventing history.
• In fact, the beginning of the year was not celebrated on April 1 in any European country. The English began the year on March 25. The French began it on Easter Day. There may have been a few, rare occasions when Easter fell on April 1, but that wouldn't have been enough to create a strong association between April 1 and the beginning of the year.
• Under the Julian calendar the year began... on January 1! So this was part of the Julian calendar that the Gregorian reforms didn't change, but actually reasserted.
• The other dates (March 25 and Easter) had been adopted in some countries because their rulers had felt the year should begin on a date of greater theological significance. But these dates were mainly used for administrative purposes (which is why the tax year still begins later in the year in some countries). Among the general population, January 1 was widely regarded as the traditional start of the year. The reason the French King officially moved the beginning of the year back to January 1 in 1564 is because he was bowing to popular demand. That's when everyone was celebrating it anyway.
• Here's the clincher: there are literary references to April 1 being a "fool's errand day" that date from before the calendar reforms. This being the case, how could the calendar reforms possibly have been the origin of the celebration?
• Finally, serious historians don't give the calendar-change theory any credence. Instead, the general consensus is that April Fool's Day is descended from some ancient pagan tradition associated with the beginning of Spring. Beyond that, it's not possible to say much. As the folklorist Alan Dundes noted about April Fool's Day, "ultimate origins are almost always impossible to ascertain definitively."

I present all this information in my article on the origin of April Fool's Day, which is one of the top links on Google if you do a search for the origin of April Fool's Day. Most of the info can also be found in the Wikipedia article on the Gregorian Calendar. Nevertheless, I realize it's probably overly optimistic to expect reporters to do much fact checking when they're on a deadline and told to write a story about the origin of April Fool's Day, which is why I expect the calendar-change hypothesis to keep getting rolled out year after year by reporters, well into the future.

Posted by Mark  in  Cincinnati  on  Thu Apr 02, 2009  at  09:12 AM

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Posted by Accipiter  on  Thu Apr 02, 2009  at  06:05 PM

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Posted by Bill Rock  in  Minnesota  on  Fri Apr 03, 2009  at  08:38 AM

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Posted by Hairy Houdini  on  Fri Apr 03, 2009  at  09:39 AM

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Posted by Matt  in  Some place  on  Wed Apr 22, 2009  at  05:49 PM

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