1. Divide the year for which you are trying to determine a leap year by four. If the year is not divisible by four, it is not a leap year. If the year is divisible by four, continue
http://www.ehow.com/how_7546950_calculateleapyea...

The modern civil/business calendar inserts February 29th in a leap year. Every year divisible by '4' is a leap year, except for the last year of each Century . 1800, 1900, 2000, etc
http://wiki.answers.com/Q/How_are_the_leap_years_c...

Rule 1: Any year evenly divisible by 400 IS a leap year. Rule 2: Any year evenly divisible by 100 is NOT a leap year, unless it conflicts with Rule 1. Rule 3: Any year evenly divisible
http://answers.yahoo.com/question/index?qid=200712...

Years that are divisible by 4, but not by 100, except when they're divisible by 400 are leap years. So the next one, as of this writing, is 2016. Update (29 February, 2012): The current
http://www.quora.com/Whenisthenextleapyear
