愚人节，又称愚人节，是每年4月1日庆祝的节日。它起源于欧洲，追溯到16世纪。有很多版本的愚人节的起源故事，下面是其中一个版本。

故事发生在16世纪的法国。当时，法国国王查理九世颁布了一项法令，规定新年将于4月1日开始庆祝，而不是过去的4月1日。然而，许多人并不知道这项法令，继续庆祝新年的旧日期。

有一些人决定开玩笑，他们将愚人节定为“假新年”，并在这一天开展各种愚弄行动，包括恶作剧和捉弄朋友等。这些人被称为“愚人”，因为他们没有遵守法律规定的新年日期。

愚人节逐渐流行开来，传播到其他欧洲国家，最终成为了全球性的节日。今天，人们在愚人节仍然会互相开玩笑和捉弄，以纪念这个有趣的节日。

The April Fool's Day, also known as the All Fools' Day, is a holiday celebrated on April 1st every year. It originated in Europe and dates back to the 16th century. There are many versions of the origin story of April Fool's Day, and here is one of them.

The story takes place in 16th century France. At that time, King Charles IX issued a decree that the new year would be celebrated on April 1st instead of the previous date. However, many people did not know about this decree and continued to celebrate the new year on the old date.

Some people decided to play a prank and declared April 1st as 'false new year,' and began various foolish actions on this day, including practical jokes and tricks on friends. These people were called 'fools' because they did not follow the legal new year date.

April Fool's Day gradually became popular and spread to other European countries, eventually becoming a global holiday. Today, people still play pranks and tricks on each other on April Fool's Day to commemorate this fun holiday.