Name     Reg.number   Limit        Date
Jon      123455665    100 000.00   24.09.2018
Foo      123423423    55 000.00    23.09.2018

Jon = text
Reg.number = text
Limit = Number (In perfect scenario with thousand separator and 2 digits after .)
Data = date

<script>

$(document).ready(function() {
    $('#datatable').DataTable();

    $.fn.dataTable.moment( 'D.M.YYYY' );

    var table = $('#datatable-buttons').DataTable({
        lengthChange: false,
        buttons: ['excel'],
    });

    table
        .order( [4 , 'desc'] )
        .draw();

    table.buttons().container()
        .appendTo('#datatable-buttons_wrapper .col-md-6:eq(0)');
} );