<!DOCTYPE qhelp PUBLIC

"-//Semmle//qhelp//EN"

"qhelp.dtd">

<qhelp>

<overview>

<include src="LeapYear.qhelp" />

<p>When performing arithmetic operations on a variable that represents a date, leap years must be taken into account.

It is not safe to assume that a year is 365 days long.</p>

</overview>

<recommendation>

<p>Determine whether the time span in question contains a leap day, then perform the calculation using the correct number

of days. Alternatively, use an established library routine that already contains correct leap year logic.</p>

</recommendation>

<references>

<include src="LeapYearReferences.qhelp" />

</references>

</qhelp>