function dayadd($g,$dayYmd) {
	//add $g days to $dayYmd (date is in YYYY-MM-DD format)
	$d = strtotime($dayYmd);
	$cc = 24*60*60*$g + 60*60 + $d;
	return date("Y-m-d",$cc);
}

http://www.barattalo.it

Add days to a date

date

PHP