i have code in php,the function of first saturday in this month
date_default_timezone_set('Asia/Jakarta');
$dt = new DateTime('first Saturday of this month');
$periode = $dt->format('Y-m-d');
it's mean that the result is first saturday of this month(july), but i want to get first saturday of january 2015,so i change my code being
$dt = new DateTime('first Saturday of January 2015');
but it has wrong result. help me please