I have a problem with my class scheduler something quite wrong in my code

[superjohnellee]

This is the image

<div class="table-responsive">
                <table class="table table-bordered table-hoverable table-striped" id="tblClassScheduler">
                    <thead>
                       <tr>
                         <?php
                          $days=array("Monday"=>1,"Tuesday"=>2,"Wednesday"=>3,"Thursday"=>4,"Friday"=>5,"Saturday"=>6,"Sunday"=>7);
                          for ($i=0;$i<COUNT($days);$i++) { 
                            echo "<th>".date("D m/d",strtotime(" +".$i." days"))."</th>";
                          }
                       ?>
                       </tr>
                    </thead>
                    <tbody>
                        <?php
                            $start_time=strtotime("08:00");
                            $end_time=strtotime("22:00");
                            for ($j=$start_time; $j<=$end_time; $j+=1800) { 
                                echo "<tr>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                        <td id='time".$j."'>".date("H:i",$j)."</td>
                                </tr>";
                            }

                        ?>
                    </tbody>
                </table>
                <center><button type="submit" class="btn btn-primary" id="save_class_schedule" id="save_class_schedule">Save</button></center>
            </div>