使用文件名附加时间戳

Question

 var tableTools = new $.fn.dataTable.TableTools(dataTable_leads,{
            'sSwfPath': '//cdn.datatables.net/tabletools/2.2.4/swf/copy_csv_xls_pdf.swf',

            aButtons: [
                       { sExtends: "csv",
                         sFileName:  'GlData_' + updateTime() + '.csv',
                         sButtonText: "<i class='fa fa-file-text'></i>",
                         mColumns: [ 0, 1, 2, 3, 4 ]

                       },
                       { sExtends: "xls",
                         sFileName: 'GlData_' + updateTime() + '.xls',
                         sButtonText: "<i class='fa fa-file-excel-o'></i>",
                         mColumns: [ 0, 1, 2, 3, 4 ]

                       },
                       { sExtends: "pdf",
                         sFileName: 'GlData_' + updateTime() + '.pdf',
                         sButtonText: "<i class='fa fa-file-pdf-o'></i>",
                         mColumns: [ 0, 1, 2, 3, 4 ]
                       }   
                   ] 
        });



function updateTime()
       {
        var currentDate = new Date()
        var day = currentDate.getDate()
        var month = currentDate.getMonth() + 1
        var year = currentDate.getFullYear()
        var d = day + "-" + month + "-" + year;


        var hours = currentDate.getHours() < 10 ? "0" + currentDate.getHours() : currentDate.getHours();
        var minutes = currentDate.getMinutes() < 10 ? "0" + currentDate.getMinutes() : currentDate.getMinutes();
        var seconds = currentDate.getSeconds() < 10 ? "0" + currentDate.getSeconds() : currentDate.getSeconds();


        var t= hours + " " + minutes + " " + seconds;


        var x = d  + " " + t;

        return x;

    }

我想添加一个带有文件名保存的时间戳。这里updatetime工作正常，并附加文件名。但是5分钟后，时间也保持不变，它没有改变。系统时间会改变，但在这里它不会改变。刷新页面时，只有在保存时间戳时间时才会更改。如何解决这个问题？请帮帮我