According to the Merriam-Webster Dictionary, a Palindrome is a word (such as kayak, madam, and level), verse, or sentence (such as “Do geese see God?”) or a number (such as 1881, 1991) that reads the same backward or forward. It was derived from the Greek word palindromos meaning “running back again.”

In 2021, there will be 22 palindrome dates in the M/DD/YY date format—11 each in January and December.

January 2021

• 1-2-21
• 1-20-21
• 1-21-21
• 1-23-21
• 1-24-21
• 1-25-21
• 1-26-21
• 1-27-21
• 1-28-21
• 1-29-21

December 2021

• 12-1-21
• 12-2-21
• 12-3-21
• 12-4-21
• 12-5-21
• 12-6-21
• 12-7-21
• 12-8-21
• 12-9-21
• 12-11-21
• 12-22-21

Meanwhile, 2021 will have two palindrome dates in a complete M/DD/YYYY date format, namely:

• January 20, 2021 (1-20-2021)
• December 2, 2021 (12-02-2021)

In 2022, there will only be one palindrome date in the M/DD/YYYY date format:

• February 20, 2022 (2-20-2022)

And one palindrome date in the DD/M/YYYY date format:

• 22 February 2022 (22-02-2022)

Quick Facts About Palindrome Days!

According to a University of Portland professor, Dr. Aziz S. Inan, palindrome dates in this format MM/DD/YYYY tend to occur only in the first few centuries of each millennium (1,000 years). In fact, the last palindromic date in the second millennium in this format was on August 31, 1830 (08-31-1380).

Dr. Inan added that, in the MM/DD/YYYY format, the first of 36 palindrome days in the current millennium (2001-3000) was October 2, 2001 (10-02-2001) and the last such day will be September 22, 2290 (09-22-2290).

Meanwhile, the palindrome days for the date format M/DD/YY are not that rare. The month in which this happens always corresponds to the last digit of the year. For example, in 2011, the Palindrome Week ran from January 10, 2011 (1-10-11) to January 19, 2011 (1-19-11). In 2012, the same sequence of dates occurred in February. In 2017, it happened in July, in 2018 in August, and in 2019, it happened in September.

Source: (1)(2)(3)

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