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Leap years almost always occur every four years, (i.e. in years that are divisible by 4). The only exceptions to this is that years that are evenly divisible by 100 are not leap years, unless they are also divisible by 400.
So this means that the years 1700, 1800, 1900, etc., were not leap years, but the year 2000 was, and the years 2400 and 2800 will be.

Leap year - Wikipedia


A leap year is a calendar year containing one additional day added to keep the calendar year ... By this rule, the average number of days per year is 365 + <sup>1</sup>⁄4 − <...

Leap Year Rules


There is a leap year every year whose number is perfectly divisible by four - except for years which are both divisible by 100 and not divisible by 400.

Leap Year Nearly Every four years - Timeanddate.com


Feb 29, 2016 ... A leap year has 366 days, as opposed to a common year, which has 365. ... one rule: any year evenly divisible by four would be a leap year.

Leap Year Explained - Infoplease


This new rule, whereby a century year is a leap year only if divisible by 400, is the sole feature that distinguishes the Gregorian calendar from the Julian calendar ...

Leap Year 101 – Next, When, List, Days, Calendar, Years ...


Rules for Determining a Leap Year. 1. Most years that can be divided evenly by 4 are leap years. (For example, 2016 divided by 4 = 504: Leap year!) 2.

Think Leap Year is Every Four Years? Think Again. | The Huffington ...


Feb 29, 2016 ... Because for the most part, Leap Year is every four years. ... Well according to the rules of the Gregorian calendar, the exceptions to this rule are ...

rules for leap year


However, this made the average length of the calendar-year slightly longer than ... Its rules are 1) years divisible by 400 ARE leap years (so, for example, 2000 ...

algorithm - leap year calculation - Stack Overflow


In general terms the algorithm for calculating a leap year is as follows... A year will be a leap ... For century years, the 400 rule is important. Thus ...

Method to determine whether a year is a leap year - Microsoft Support


Dec 17, 2015 ... Any year that is evenly divisible by 4 is a leap year: for example, 1988, ... only the year 1900 is subject to the 100/400 exclusion rule of leap ...