$mb_date_arr = explode(" ", $mb['mb_datetime']);
$mb_arr = $mb_date_arr[0];
$mb_time = explode("-", $mb_arr);
$mb_y = $mb_time[0];
$mb_m = $mb_time[1];
$mb_d = $mb_time[2];
$mb_datetime = $mb_y."년".$mb_m."월".$mb_d."일";
echo $mb_datetime;
