CFLib.org – Common Function Library Project

Description:
Function that determines if a given date range contains a leap year. Returns true if it contains a leap year, false if not.

Return Values:
Returns a boolean.

Example:

<CFOUTPUT>
	containsLeapYear("1/1/2002", "6/1/2002") = #containsLeapYear("1/1/2002", "6/1/2002")#<br>
	containsLeapYear("1/1/2003", "6/1/2003") = #containsLeapYear("1/1/2003", "6/1/2003")#<br>
	containsLeapYear("1/1/2004", "2/1/2004") = #containsLeapYear("1/1/2004", "2/1/2004")#<br>
	containsLeapYear("1/1/2004", "6/1/2004") = #containsLeapYear("1/1/2004", "6/1/2004")#<br>
</CFOUTPUT>

Parameters:

Full UDF Source:

<cfscript>
/**
 * Function that determines if a given date range contains a leap year.
 * 
 * @param startDate 	 Initial date. (Required)
 * @param endDate 	 Ending date. (Required)
 * @return Returns a boolean. 
 * @author Mosh Teitelbaum (&#109;&#111;&#115;&#104;&#46;&#116;&#101;&#105;&#116;&#101;&#108;&#98;&#97;&#117;&#109;&#64;&#101;&#118;&#111;&#99;&#104;&#46;&#99;&#111;&#109;) 
 * @version 1, May 26, 2003 
 */
function containsLeapYear(startDate, endDate) {
	// Build offsets
	var StartDateYearOffset = DateAdd("yyyy", 1, startDate);
	var StartDateYearOffsetInDays = DateDiff("d", startDate, StartDateYearOffset);
	var EndDateYearOffset = DateAdd("yyyy", 1, Trim(endDate));
	var EndDateYearOffsetInDays = DateDiff("d", endDate, EndDateYearOffset);

	// Return result
	return IIf(StartDateYearOffsetInDays - EndDateYearOffsetInDays GT 0, DE("true"), DE("false"));
}
</cfscript>