February 29 is a date that occurs only every four years, in years evenly divisible by 4, such as 1988, 1996, 2008 or 2016 (with the exception of century years not divisible by 400, such as 1900) for the Gregorian calendar, which is most widely used in the world today. These are called leap years, and February 29 is the 60th day of the Gregorian calendar in such a year, with 306 days remaining until the end of that year. February 29 is also known as bissextile day or Leap Day.
From Dictionary.com :
bis·sex·tile (bī-sěk'stĭl, -stīl', bĭ-)
Of or relating to a leap year.
Of or relating to the extra day falling in a leap year.
n. A leap year.
So this date, February 29th, comes about only every four years. It’s a kind of special occasion. And for folks born on this date it’s a rather unusual thing - their birth date comes around only every fourth year. Sort of like using an Earth calendar while living on Mars. Or vice-versa.
Today is the Leap Day. So enjoy it. Or not. Just figured you’d want a reminder.