1. The more common saying is that it originated in France. In 1564, the French Emperor Charles IX announced that the whole country would switch to the Gregory calendar, so the New Year’s activities originally held on April 1 were brought forward to January 1. Charles IX The reform was opposed by some old-fashioned people. They still celebrated the New Year according to the old calendar, gave gifts to each other, and held various celebrations. On the grounds of the event, conservatives were defrauded to participate in the event and given fake gifts to them. The deceived conservatives who came to participate in the event were called "April fools" or "baited fish". Mutual mockery gradually became popular in France and eventually became April Fool's Day. April Fool's Day not only became a favorite festival in France, but also spread to England in the 18th century, and was later brought to the United States by early British immigrants, and was brought to the American continent with the British colonial movement and immigration activities. A popular festival in Europe and America.
 
2. In the beginning, any American can concoct appalling news without any moral or legal responsibility, and the government and judiciary will not pursue it. On the contrary, whoever makes up the most bizarre lies and can deceive people into believing the most will be awarded the laurels. This approach has brought a lot of confusion to the society, which has caused people's dissatisfaction. Fooling and cheating during the holiday season is no longer as outrageous as it used to be, but for the purpose of lighthearted fun.

3. Jokes can only be played until 12:00 noon on April Fool's Day, which is a strict rule of convention. A man who is having fun after noon is a bigger fool than the man he makes fun of. Anyone who jokes after the hour will immediately run into trouble and find himself out of fun. There is a little poem that describes it like this: It's past twelve o'clock on April Fool's Day, you big fool come late.