What is a square root day...square root day is actually a date where the day and the month are both the square root of the last two digits of the current year. Just like today March 3, 2009 or 3/3/09 or √9 = 3, or 3² = 3 × 3 = 9.

The last square root day occurred last February 2, 2004 or 2/2/04 and the next will be this coming April 4, 2016 or 4/4/16. Square Root Day occurs nine times in a century.