CFLib.org – Common Function Library Project

Description:
Returns a date object representing the first day of the previous month. Optional parameters allows you to provide the date you want to calculate the prior month from.

Return Values:
Returns a date object.

Example:

<CFOUTPUT>
Last Month began on #DateFormat(LastMonth())#
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns a date object representing the first day of the previous month.
 * 
 * @param Date      Date object to go to the previous month on. Defaults to now. 
 * @return Returns a date object. 
 * @author Will Belden (wbelden@dwo.net) 
 * @version 1, September 6, 2001 
 */
function LastMonth() {
    var db = iif(arrayLen(arguments),"arguments[1]","now()");
    return DateAdd("m",-1,CreateDate(Year(db), Month(db), 1));
}