Change column name for date range while exporting pdf or xls

cooldt

Using Datatables with columnFilter and TableTools plugin. Table has date ranges as filters. While exporting to pdf the column name is "Expiry Date: From {from} to {to}", which doesnt look good in the report. Is there any way I can change this column name while exporting to pdf or xls. Below is my code.

            //create new table
            var table = $('#theListTable').dataTable( {
                "dom": 'T<"clear">lfrtip',
                "tableTools": {
                    "sSwfPath": "../swf/copy_csv_xls_pdf.swf",
                    "aButtons": [
                                 {
                                     "sExtends": "xls",
                                     "sButtonText": "#{searchMsg['lbl.exportToExcel']}",
                                     "oSelectorOpts": { filter: 'applied', order: 'current' }
                                 },
                                 {
                                     "sExtends": "pdf",
                                     "sButtonText": "#{searchMsg['lbl.exportToPdf']}",
                                     "oSelectorOpts": { filter: 'applied', order: 'current' }
                                 }
                            ]
                },
                    "columns": [
                        { "title": "#{searchMsg['lbl.eventId']}" },
                        { "title": "#{searchMsg['lbl.eventDate']}" },
                    ]
                } )
                .columnFilter({ sPlaceHolder: "head:after",
                    aoColumns: [ {sType: "number"},
                                 {type: "date-range", sRangeFormat: "#{searchMsg['lbl.eventDate']}" },
                                ]

                });

Column names appers in xls or pdf as below:
Event Number Event Date: From {from} to {to}