here is a sample using 2 udf's DIRPlus() and FlipCTime()

Code:

$path = 'c:\temp'

$files = dirplus($path,"/s /a-d")

$15days = 60*60*24*15

for each $file in $files
	$filedate = split($file.DateLastModified)
	$filedate[0] = split($filedate[0],"/")
	if flipctime($filedate[0][2] + "/" + $filedate[0][1] + "/" + $filedate[0][0],$filedate[1]) <= flipctime(@date,@time)-$15days
		? $file.name + " is 15+ days old:	" + $file.DateLastModified
	endif
next