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).