2 Answers

The last was leap year was 2008, the next will be 2012.  It's every 4 years.  It's a year, not a century.  There is an extra day added to February - 29 instead of the usual 28 days.

melissaann mac, forgive me for not understanding your question,  my Bad, sorry.  So, here is the answer to your questions.  It came directly from www.wikipedia.com  I found it very interesting, something I didn't know.  Thumbs up for a great question. regards/yvonne57

In the Gregorian calendar, an end-of-century leap year (often improperly referred to as a century leap year) is a year that is exactly divisible by 400 and, as with every other leap year, qualifies for the intercalation of February 29. End-of-century years that are exactly divisible by 4 but not by 400 are common years. The years 1600 and 2000, for example, were end-of-century leap years. The end-of-century years 1700, 1800, and 1900 were common years, as will be 2100, 2200 and 2300. The next end-of-century leap year will be 2400. End-of-century leap years always start on a Saturday, and the resulting February 29 is always on a Tuesday.