Hello.

Since some days i try to create a webpage with a google chart. The input is 
a json formated file.
Everything works except the display of the date. Target is "2016-01" or 
"2016-Jan" but what i get is only "Thu Dec 31 2016, etc etc"


<https://lh3.googleusercontent.com/-zSJvtKBtDKU/V3zfw8Cd8mI/AAAAAAAAHuk/EmMX1JAgTOoYEoeUrydLNigTCbxE436YQCLcB/s1600/chart1.jpg>



























How can i change the date to year and month?
Thank you very much for any hint.
Christian

Source Code:
graph.html

<html>
  <head>
    <!--Load the AJAX API-->
    <script type="text/javascript" 
src="https://www.gstatic.com/charts/loader.js";></script>
    <script type="text/javascript" 
src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
    <script type="text/javascript">

var options = {
        animation: {
                duration: 3000,
                startup: true //This is the new option
            },
        title: 'Verbrauch',
        hAxis: {
          title: 'month',
          format: 'Y',
        },
        vAxis: {
          title: 'kWh'
        },
        width: 1200,
        height: 500

      };

    // Load the Visualization API and the piechart package.
//    google.charts.load('current', {'packages':['corechart']});
        google.charts.load('visualization', '1.1', {'packages': 
['corechart']});


    // Set a callback to run when the Google Visualization API is loaded.
    google.charts.setOnLoadCallback(drawChart);

    function drawChart() {
      var jsonData = $.ajax({
          url: "getData.php",
          dataType: "json",
          async: false
          }).responseText;

      // Create our data table out of JSON data loaded from server.
      var data = new google.visualization.DataTable(jsonData);

      // Instantiate and draw our chart, passing in some options.
      var chart = new 
google.visualization.ColumnChart(document.getElementById('chart_div'));

        chart.draw(data, options);
    }

    </script>
  </head>

  <body>
    <!--Div that will hold the pie chart-->
    <div id="chart_div"></div>
  </body>
</html>


data.json:
{
        "cols": [
                {"label":"Date","type":"string"},
                {"label":"Basis Tarif","type":"number"},
                {"label":"H/N Tarif","type":"number"},

                ],

        "rows": [
                
{"c":[{"v":"Date(1451601300000)"},{"v":"355.228"},{"v":"179.224"}] },
                
{"c":[{"v":"Date(1451602800000)"},{"v":"373.213"},{"v":"290.455"}] },
                
{"c":[{"v":"Date(1454281200000)"},{"v":"379.148"},{"v":"201.963"}] },
                
{"c":[{"v":"Date(1456786800000)"},{"v":"374.395"},{"v":"178.306"}] },
                
{"c":[{"v":"Date(1459461600000)"},{"v":"361.792"},{"v":"78.485"}] },
                
{"c":[{"v":"Date(1462053600000)"},{"v":"347.246"},{"v":"51.025"}] },
                
{"c":[{"v":"Date(1464732000000)"},{"v":"347.201"},{"v":"39.039"}] },
                ]

}



getData.php
<?php

// It reads a json formatted text file and outputs it.

$string = file_get_contents("data.json");
echo $string;

// Instead you can query your database and parse into JSON.

?>



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