containsLeapYear(startDate, endDate)
Last updated May 26, 2003
Version: 1 | Requires: ColdFusion 5 | Library: DateLib
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:
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:
| Name | Description | Required |
|---|---|---|
| startDate | Initial date. | Yes |
| endDate | Ending date. | Yes |
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 (mosh.teitelbaum@evoch.com)
* @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>
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