try that:
<?
//convert date formatted such as '2001-01-30' to new pattern
function convert_date ($date_to_convert,$pattern_date){
$year= substr($date_to_convert, 0,4);
$month= substr($date_to_convert, 5,2);
$day= substr($date_to_convert, -2);
$newdate = date ("$pattern_date", mktime (0,0,0,$month,$day,$year));
return $newdate;
};
$today = date ("Y-m-d");
print "<P><b>Today converted</b> : " . convert_date ($today, "d/m-y");
?>