Date(-62135596800000) ส่งจาก Javascript ไปหา Controller[C#]

var BillDate = {
            BillDate1: $("#DueDate").val()
        };

        $.ajax({
            method: 'POST',
            url: "@Url.Action("ImportBill", "ManageChqinfo")",
            content: "application/json; charset=utf-8",
            data: JSON.stringify(BillDate),
            dataType: 'JSON',
            success: function (d)
            {
                BootstrapDialog.show({
                    title: "Alert",
                    message: d.Message,
                    buttons: [{
                        label: 'Close',
                        action: function (dialogItself) {
                            dialogItself.close();
                            location.reload();
                        }
                    }]
                });
            }
        });