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Some historians speculate that April Fools' Day dates back to 1582, when France switched from the Julian calendar to the Gregorian calendar, as called for by the Council of Trent in 1563. In the...
It's no joke: April 1 used to be New Year's Day
This major change, which had to make health care reform seem simple, revamped the annual calendar in the entire civilized world. The King of France, Charles IX, instituted the switch in 1564. Foremost was beginning the New Year on January 1st instead of on April 1st. Problem was 16th century communications were not what they are today