问PHP强制日期为CSV格式的文本

EN

if(strlen($date) == 10){

        // 12-24-1983
        $date = explode('-',$date);
        $m = $date[0];
        $d = $date[1];
        $Y = $date[2];

        $date = $Y.'-'.$d.'-'.$m.' 00:00:00';
    }
    else {
        // 2014-08-07 21:04:19
        $date = explode(' ',$date);
        $datePiece = $date[0];
        $timePiece = $date[1];

        $datePiece = explode('-',$datePiece);

        $Y = $datePiece[0];
        $m = $datePiece[1];
        $d = $datePiece[2];

        $date = $Y.'-'.$d.'-'.$m.' '.$timePiece;
    }

    return "$date";