코멘트 작성일 변경입니다. 도와주세요..

<?php if ($is_admin) { ?><form name='hp_comment_update' method='post' style='padding:0;' 
action="<?php echo $board_skin_path; 
?>/write_comment_update.skin.php">          <?php            $sql_comment = " select wr_id, wr_datetime from $write_table where wr_id = '$comment_id' ";            $result_comment = sql_query($sql_comment);            while($row_comment = mysql_fetch_array($result_comment)) {            ?>            <input type="hidden" name="cid" value="<?php echo $comment_id; ?>" />            작성일 <input required style="width:140px;" name="cdate" maxlength="19" value="<?php echo $row_comment[wr_datetime]; ?>" />            <input type="submit" name="submit"  value="수정">          </form>        <?php } ?>​