cal ใน unix มีไว้สำหรับดูปฎิทินของเดือนใด ๆ ก็ได้ ง่ายสุดคือการดูทั้งปี โดยใส่ argument เป็นปีค.ศ.ลงไป เช่น
$ cal 2005
จะได้ผลลัพธ์ดังนี้

หรือระบุเดือนที่ต้องการลงไปจะได้ผลดังนี้
$ cal 6 2005

แต่ถ้าลองไปดูเดือนกันยายนปี 1752 กลับได้ผลลัพธ์ดังนี้

เหตุผลเป็นเพราะว่ามีการเปลี่ยนระบบปฏิทินจาก Julian Calendar เป็น Gregorian Calendar ซึ่งมีการทดวันใหม่
ทุกคนคงทราบกันดีว่า ปีค.ศ. ที่หารด้วย 4 ลงตัวจะมีวันที่ 29 กุมภาพันธ์ แต่มีไม่กี่คนที่รู้ว่าปีที่หาร 4 ลงตัว แต่หาร 100 ลงตัวจะไม่มีวันที่ 29 กุมภาพันธ์ แต่ปีที่หาร 400 ลงตัวจะมีวันที่ 29 กุมภาพันธ์ แล้วปัญหาก็คือในสมัยก่อนไม่มีการหักลบวันที่หารด้วย 100 ลงตัวออกไป จึงทำให้ปฏิทินคลาดเคลื่อน เพราะวันเกินมา จึงทำให้มีการชดเชยทีเดียวในเดือนกันยายน 1752 ทีเดียวเลย

ขอขอบคุณ อ.เฉลิมศักดิ์ที่ทำให้รู้อะไรดี ๆ มากขึ้นครับ

ใครอยากอ่านเพิ่มลองดูที่นี่ได้ครับ
http://www.ancestry.com/learn/library/article.aspx?article=3358
http://www.trialsofgrizelda.com/harvest/September%201752.htm
http://www.wisdomportal.com/Dates/1752Jupiter.html

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