Binary Dates in 2011

Date: January / 02 / 2011 + Comments: 0

The following dates from 2011 look like binary numbers.

Binary Dates in 2011 (mm/dd/yy)

Date mm/dd/yy Binary Decimal
January 1st, 2011 01/01/11 10111 23
January 10th, 2011 01/10/11 11011 27
January 11th, 2011 01/11/11 11111 31
October 1st, 2011 10/01/11 100111 39
October 10th, 2011 10/10/11 101011 43
October 11th, 2011 10/11/11 101111 47
November 1st, 2011 11/01/11 110111 55
November 10th, 2011 11/10/11 111011 59
November 11th, 2011 11/11/11 111111 63

Binary Dates in 2011 (dd/mm/yy)

Here they are in dd/mm/yy format:

Date dd/mm/yy Binary Decimal
January 1st, 2011 01/01/11 10111 23
January 10th, 2011 10/01/11 100111 39
January 11th, 2011 11/01/11 110111 55
October 1st, 2011 01/10/11 11011 27
October 10th, 2011 10/10/11 101011 43
October 11th, 2011 11/10/11 111011 59
November 1st, 2011 01/11/11 11111 31
November 10th, 2011 10/11/11 101111 47
November 11th, 2011 11/11/11 111111 63

And in case you were wondering, 2011 = 11111011011 in binary.

Palindromes

Considering dates as numbers leads you to wonder which are number palindromes.

A palindromic number, or number palindrome, is a number like 42824, which is the same written forward and backward.

Numbers written with leading zeros are not palindromes, so numbers ending with zeros are not palindromes either. This means no dates in 2010 are palindromic. In 2011 however, there are palindromic dates. There are several consisting of all 1s, like 1/1/11, but those are not interesting. That leaves two palindromic dates made up of both 0s and 1s:

  • January 10th, 2011, in mm/dd/yy format: 1/10/11.
  • October 1st, 2011, in dd/mm/yy format: 1/10/11.

Both are the same binary number: 11011 (27 decimal).

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Post author: Daniel Semper

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