date_isodate_set

<?

$object = date_create();
$year = 2001;
$week = 2;

date_isodate_set($object, $year, $week);

echo date_format($object, "Y-m-d");

?>

2001-01-08

<?

$object = date_create();
$year = 2001;
$week = 2;
$day = 3;

date_isodate_set($object, $year, $week, $day);

echo date_format($object, "Y-m-d");

?>

2001-01-10

<?

$object = date_create();
$year = 2001;
$week = 2;
$day = 3;

$return = date_isodate_set($object, $year, $week, $day);

var_export($return);

?>

\DateTime::__set_state(array(
   'date' => '2001-01-10 05:57:16.650848',
   'timezone_type' => 3,
   'timezone' => 'UTC',
))