Original: February 29 in the Gregorian calendar , the most widely used today , is a date that occurs only once every four years , in years evenly divisible by 4 , such as 1996 , 2000 , 2004 , 2008 , 2012 or 2016 ( with the exception of century years not divisible by 400 , such as 1900 ) .
Simplified: This date only occurs every four years , in years that can be exactly divided by 4 , such as 1988 , 1996 , or 2008 , except century years that can not be divided by 400 without leaving a remainder , such as 1900 .