Description:
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I want to pass a date type variable into oracle's procedure.
But It automate converts date type into string.

Reproduce code:
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$sql = 'declare ws_time date := :mydate; begin  select con_id from home.zcontp00; end;
$stmt = oci_parse($this->conn, $sql);
$my_cursor = ociNewCursor($this->conn);
$now = date('Y-m-d',strtotime('2009-09-08'));
OCIBindByName($stmt, ":mydate",$now);
OCIBindByName($stmt, ":c1", $my_cursor, -1, OCI_B_CURSOR);	   
OCIExecute($stmt);
OCIExecute($my_cursor);
while ($val = oci_fetch_assoc($my_cursor)){
  echo $val['CON_ID'];
}

Expected result:
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Above Report error.
  " literal does not match format string "