Sort table date-eu in mysql datatables

EHT

I generate my table with this code but my "type: 'date-eu', targets: 6" dosen't work:

$(document).ready(function() {

var dt = $('#example').DataTable( {
    columnDefs: [
            { type: 'date-eu', targets: 6 }
     ],
    "processing": true,
    "serverSide": true,
    "ajax": "tableau/ids-ndf.php",
    "iDisplayLength": 25,
    "columns": [ 
        {
            "class":          "details-control",
            "orderable":      false,
            "data":           null,
            "defaultContent": ""
        },
        { "data": "ID_Ndf" },
        { "data": "Intitules_Ndf" },
        { "data": "Nom_Projets" },
        { "data": "Nom_Salaries" },
        { "data": "Prenom_Salaries" },
        { "data": "Dates_Ndf" },
        { "data": "Total_TTC_Ndf" },
        }

    ],
    "order": [[1, 'desc']]
} );

When i sort i have:

01/01/2013
01/03/2013
01/04/2014
01/06/2013
01/06/2013

And i want:

01/01/2013
01/03/2013
01/06/2013
01/06/2013
01/04/2014

Can you help me please?
Where is my fail

EHT

help please