And the rose fell on Azora's paw. Most likely, many have heard this sentence, which is equally written both in the usual manner and backwards. Similar words or phrases are called palindromes. But besides palindromic texts there are also numbers-shifters. Palindrome dates attract particular attention.
Palindrome Dates
Such unusual in nature numbers are found only in the first centuries of the millennium. In this millennium, there will be 36 such palindrome dates, the last of which will take place on September 22, 2290. The next calendar palindrome will be only on October 3, 3001.
For example, in 2020, only one day is a palindrome in the format m-dd-yyyy: in February, the second day, 2-02-2020. Palindromic dates also depend on how the date is formatted, which may vary depending on where you live. If you specify the date in a different way, for example, as mm-dd-yy, which is widely distributed in the United States, two more dates will appear in 2020, and both will be in February: 11 (02-11-20) and 22 (02-22 -20) numbers. It is for this reason that experts say that for security reasons, it is better to prescribe the year 2020 in full so as to prevent counterfeiters from falsifying your documents.
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Scientists research
Aziz S. Inan, a professor of electrical engineering at the University of Portland, calculated that when dates are written in the month-day-year order, palindrome days usually fall only in the first few centuries of every millennium. For example, in the current millennium (01/01/2001. - 12/31/3000.) The very first date-palindrome occurred in October 2001, the 2nd (10-02-2001), and the most recent calendar palindrome of this millennium will be September 22, 2290 years (09-22-2290).
For countries that use our usual format (day-month-year), this century will have 29 palindromic days. The first was in February 2001, the 10th (10-02-2001). The last palindrome will be on a leap day: February 29, 2092 (29-02-2092), which will also be the last day of the 21st century palindrome.
Palindrome of the week
Although it may seem that the appearance of a date-palindrome - or a week-palindrome - is a rather rare occurrence, according to Inan, this is not entirely true.
Since 2011, every year there is a 10-day palindrome. For example, in 2011 such a decade began on January 10 (from 1-10-11 to 1-19-11), and in 2012 another one began on February 10 (from 2-10-12 to 2-19-12), In 2019, this happened in September.
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In the m-dd-yy format, every century has nine years with ten consecutive palindrome days. Moreover, they always fall into the second decade of the century. Each year between 2011-2019, 2111-2119 and 2211-2219 there will be 10 days-palindromes in a row.
But palindromic dates are not the only shifter numbers. For example, there is such a numerical palindrome: 50, 20, 10, 01, 02, 05. This is a list of all pence, British coins in circulation and amounting to the pound sterling. Other models include repeating dates (1/11/11 = 11111), repeating sequences (10/31/03 = 103 103) and consecutive dates (8/9/10 = 8, 9, 10; and if you start with time 12: 34: 56.7, you will get 1, 2, 3, 4, 5, 6, 7, 8, 9, 10).
