input type date

bonjour j'ai un code php et il y a une formulaire html de-dans, et le input date de mon formulaire ne retourne pas la date que je selectionne et je ne comprend pas pourquoi, si quelqu'un peux me dire ou se trouve mon probléme, voila mon code

<?php
include("header_date.php");
?>
<?php
$hostdb = 'localhost';
$userdb = 'root';
$passdb = '';
$namedb = 'mfb';

try
   {
     $conn = new PDO("mysql:host=".$hostdb."; dbname=".$namedb."", $userdb, $passdb, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
     $conn->exec("SET CHARACTER SET utf8");
    }
catch (PDOException $e)
   {
     echo 'La base de donnée n\'est pas disponible';
    }

$erreur_requete = null;
$tableau_ville = array();

try
{
        if(isset($_POST['bouton']))
  {
          $stmt = $conn->prepare("INSERT INTO projet(projet_id, projet_nom, projet_descr, projet_debut, projet_fin) VALUES ( ?, ?, ?, ?, ?)");
          $stmt->execute(array($_POST['ID'],$_POST['Nom'],$_POST['Description'],$_POST['Debut'],$_POST['Fin']));
          print_r($stmt->errorInfo());

          header('Location: projet.php');
          exit;
  }
        else
        {
                $req = "SELECT * FROM projet";
                $res = $conn->query($req);

                $tableau_projet = $res->fetchAll(PDO::FETCH_ASSOC);

                $res->closeCursor();
        }
}
catch(PDOException $e)
{

   $erreur_requete = "Problème dans la requête";

     $erreur_requete .= " : ".$e->getMessage();
}

?>

    <div>

        <?= isset($erreur_requete) ? $erreur_requete : '';?>
    </div>
    <script>
            $(function() {
            $( "#Debut" ).datepicker({
            numberOfMonths: 2,
            onClose: function( selectedDate ) {
            $( "#Fin" ).datepicker( "option", "minDate", selectedDate );
            }
            });
            $( "#Debut" ).datepicker({
            numberOfMonths: 2,
            onClose: function( selectedDate ) {
            $( "#Fin" ).datepicker( "option", "maxDate", selectedDate );
            }
            });
            });
            </script>

    <form name="form" action="ajout_projet.php" method="POST" enctype="multipart/form-data" >
                <fieldset>
            <legend><em>Ajout d'un Projet</em></legend>
            <table align="center">
            <tr>
                <td></td>
            </tr>
            <tr>
                <td>
                    <label for="ChampCode">ID du projet:</label>
                </td>
                <td>
                    <input type="text" id="ID" name="ID" require/>
                </td>
            </tr>
            <tr>
                <td>
                    <label for="ChampNom">Nom du Projet:</label>
                </td>
                <td>
                    <input type="text" id="Nom" name="Nom" require/>
                </td>
            </tr>
            <tr>
                <td>
                    <label for="ChampDescription">Projet Description:</label>
                </td>
                <td>
                    <input type="text" id="Description" name="Description" require/>
                </td>
            </tr>
            <tr>

            <script>
            $(function() {
            $( "#from" ).datepicker({
                defaultDate: "+1w",
changeMonth: true,
            numberOfMonths: 1,
            onClose: function( selectedDate ) {
            $( "#to" ).datepicker( "option", "minDate", selectedDate );
            }
            });
            $( "#to" ).datepicker({
                defaultDate: "+1w",
changeMonth: true,
            numberOfMonths: 1,
            onClose: function( selectedDate ) {
            $( "#from" ).datepicker( "option", "maxDate", selectedDate );
            }
            });
            });
            </script>
                 <td>
            <div class="demo">D&eacute;but du projet: <td><input type="date" id="from" name="Debut"></td></div>
            </td>
            </tr>
            <tr>
            <td>

            <div class="demo">Fin du projet: <td><input type="date" id="to" name="Fin"></td></div>
                </td>
            </tr>

        <tr>
        <td></td>       
    <td>
        <form action="ajout_projet.php" method="POST">
            <input type="submit" name="bouton" value="Ajouter" style="background-color: black;
width: 80px;
height:30px;
border-radius: 6px;
color: white;
font-family: algerian;
text-align: center;" /> 
            <a href='projet.php'><input class='button' type='button' value='Annuler' style="background-color: black;
width: 80px;
height:30px;
border-radius: 6px;
color: white;
font-family: algerian;
text-align: center;"></a>
        </form>
    </td>
            </tr>
        </table>
        </fieldset>
    </form>

    <?php
include("footer.php");
?>