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This article is about how to use the cal command in Linux. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

I used to hear that a very strange month can be found on Linux, but I forgot that special month at that time. Today, I searched the Internet and found that I learned about human time reform through the Linux cal command (month).

# cal 9 1752 September 1752

One, two, three, four, five, six.

1 2 14 15 16

17 18 19 20 21 22 23

24 25 26 27 28 29 30

We found that September 2, 1752 was followed by the 14th, which was really strange. By searching the Internet, we found the answer:

In February 1582, the Holy see demanded that 10 days be subtracted from mid-October 1582, so October 4, 1852 was followed by the 15th. It has been dealt with in Italy, Spain and other countries. Other Catholic countries soon followed suit, but Protestant countries were reluctant to modify it, and orthodox countries such as Greece did not modify it until the beginning of the 20th century, so the reform was not implemented in Britain and its colonies (including the United States) in September 1752. So September 2, 1752 was followed by September 14, 1752. This is why cal generates the above output.

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