CFLib.org – Common Function Library Project

Description:
Returns the date for the End of Daylight Saving Time for a given year. If no year is specified, defaults to current year.

Return Values:
Returns a date object.

Example:

<CFOUTPUT>
This year, Daylight Saving Time ends on #DateFormat(GetDaylightSavingTimeEnd(), 'dddd, mmm dd, yyyy')#.
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the date for the End of Daylight Saving Time for a given year.
 * This function requires the GetLastOccOfDayInMonth() function available from the DateLib library.
 * 
 * @param TheYear      Year you want to return the end of Daylight Saving Time. (Optional)
 * @return Returns a date object. 
 * @author Ken McCafferty (mccjdk@yahoo.com) 
 * @version 1, December 20, 2006 
 */
function getDaylightSavingTimeEnd() {
    var TheYear=Year(Now());
      if(ArrayLen(Arguments)) TheYear = Arguments[1];
    //US Congress changed it for 2007,may switch back
    // From last Sunday in October to First Sunday in November 
    if(TheYear lt 2007) return CreateDate(TheYear,10,GetLastOccOfDayInMonth(1,10,TheYear));
    else return CreateDate(TheYear,11,GetNthOccOfDayInMonth(1,1,11,TheYear));
    return CreateDate;
}