02/15/2015 — Happy Permutation Day!
Today we celebrate the second Permutation Day of the year! I call days like today permutation days because the digits of the day and the month can be rearranged to form the year.
Additionally, today is a transposition day, as a single swap of two digits is all that’s need to turn the day-month into the year.
Celebrate Permutation Day by mixing things up! Try doing things in a different order today. Just remember, for some operations, order definitely matters!