en.wikipedia.org/wiki/Leap_year

A **leap year** is a calendar year containing one additional day added to keep the
calendar year synchronized with the astronomical or seasonal year. Because ...

support.microsoft.com/en-us/help/214019/method-to-determine-whether-a-year-is-a-leap-year

Describes how to **determine** whether the year in a date that is used in an Excel
document is a **leap year**.

www.mathsisfun.com/leap-years.html

A **Leap Year** has 366 days (the extra day is the 29th of February). ... Leap Years
are any year that can be evenly divided by 4 (such as 2012, 2016, etc). not ...

stackoverflow.com/questions/725098/leap-year-calculation

Apr 7, 2009 **...** There's an algorithm on wikipedia to **determine leap** years: function isLeapYear (
**year**): if ((**year** modulo 4 is 0) and (**year** modulo 100 is not 0)) ...

www.wikihow.com/Calculate-Leap-Years

How to Calculate Leap Years. To calculate if a year is a **leap year** is easy. Start
off using the year you want to calculate.

exceljet.net/formula/year-is-a-leap-year

If you want to test whether the year of a certain date is a **leap year**, you can use a
**formula** that uses the MONTH, YEAR, and DATE functions. In the example ...

www.perlmonks.org/?node_id=32583

Sep 15, 2000 **...** The **leap year formula** is: A leap year is divisable by 4, but not by 100 (except if
divisable by 400.) if( 0 == $year % 4 and 0 != $year % 100 or 0 ...

superuser.com/questions/926298/need-a-formula-for-leap-year

Jun 10, 2015 **...** So if you have a year in A1 this **formula** will return if it is a **leap year** or not. ... If it is
not a **leap year** the program rounds February 29 to March 1 ...