I am trying to show the datatables on the right page (pagination) with the current date or later with the help of the jumpToData() function, e.g. today is the 2016-08-08. The page of the datatables should automatically (when finished loading) be set on this date (column 0). If the date is not available it should jump to the page with the next date available. So far I have this code:

       jQuery.fn.dataTable.Api.register( 'page.jumpToData()', function ( data, column ) {
        var pos = this.column(column, {order:'current'}).data().indexOf( data );
        var followingdays = 0;
        while(pos == -1 && followingdays < 10){
            var day = (parseInt(data.subString(8))+1);
            if(day > 31){ //wenn >31 monatswechsel
                day = "01";
                var month=parseInt(data.subString(5,7))+1;
                var year = parseInt(data.subString(0,4));
                if(month < 10){
                    month = "0" + month.toString();
                } else if(month > 12){
                    year = year + 1;
                }
                data = year.toString() + "-" +month + "-" + day;
            }else if(day < 10){
                day = "0" + day.toString();
                data = data.substring(0,8) + day;
            }else{
                data = data.substring(0,8) + day;
            }   
            pos = this.column(column, {order:'current'}).data().indexOf( data );
            followingdays++;
        }
        if ( pos >= 0 ) {
            var page = Math.floor( pos / this.page.info().length );
            this.page( page ).draw( false );
        }
        return this;
    } );

This is a workaround however since I just look at the current date plus the following 10 days and not the general future of the current date. I can live with that for now hence my first question is that I get a TypeError in the line.

  var day = (parseInt(data.subString(8))+1);

and I dont know why. data.subString(8) should be '08' in the example given. data is correct: '2016-08-08'. The jumpToData() is called in my initComplete method of the datatables:

   "initComplete": function(settings, json) { 

                var ftable = $('#table_fuehrungen').DataTable();

                    var today = new Date();
                    var dd = today.getDate();
                    var mm = today.getMonth()+1; //January is 0
                    var yyyy = today.getFullYear();

                    if(dd<10) {
                        dd='0'+dd
                    } 

                    if(mm<10) {
                        mm='0'+mm
                    } 
                    today = yyyy+"-"+mm+"-"+dd;

                   ftable.page.jumpToData( today, 0 );
              },

Thus my first question is why there is a TypeError on the given line and the second quesion is how do I code it better to jump to the page with the generic future of the current date?

I am using DataTables 1.10.12.