This is my code: 

 var data = new google.visualization.DataTable();
              data.addColumn('date', 'Value');
              data.addColumn('number', 'Value');

              var jsonData =   [ { "added_date" : "new Date(2018,0,31)",
                                "count"      : "42" },
                              { "added_date" : "new Date(2018,1,1)",
                                "count"      : "127" },
                              { "added_date" : "new Date(2018,1,2)",
                                "count"      : "26" },
                              { "added_date" : "new Date(2018,1,3)",
                                "count"      : "94" },
                              { "added_date" : "new Date(2018,1,5)",
                                "count"      : "14" },
                              { "added_date" : "new Date(2018,1,6)",
                                "count"      : "31" },
                              { "added_date" : "new Date(2018,1,7)",
                                "count"      : "2" },
                              { "added_date" : "new Date(2018,1,8)",
                                "count"      : "214" },
                              { "added_date" : "new Date(2018,1,9)",
                                "count"      : "26" },
                              { "added_date" : "new Date(2018,1,10)",
                                "count"      : "26" },
                              { "added_date" : "new Date(2018,1,11)",
                                "count"      : "10" },
                              { "added_date" : "new Date(2018,1,12)",
                                "count"      : "102" },
                              { "added_date" : "new Date(2018,1,13)",
                                "count"      : "6" } ]; 
              for (var i = 0; i < jsonData.length; i++) {
                  
                  
 data.addRow([jsonData[i].added_date,parseInt(jsonData[i].count)]);
              }
                var options = {
                    title: 'Date wise Usage'
                };
              var chart = new 
google.visualization.ColumnChart(document.getElementById("columnchart"));
              chart.draw(data, options);

when execute i have got the error 
*Uncaught Error: Type mismatch. Value new Date(2018,0,31) does not match 
type date in column index 0*

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