title: Google chart how to show display time statistic
body: <p>Hi I want to show in google chart two column. First with time (eg. 06:02) second with value (eg. 3). </p>
  
  <p>I try:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
    google.load('visualization', '1', {packages: ['corechart']});
  &lt;/script&gt;
  &lt;script type="text/javascript"&gt;
    function drawVisualization() {
  
    var data = new google.visualization.DateFormat();
  
    // Declare columns
    data.addColumn('datetime', 'Time of Day');
    data.addColumn('number', 'Some Measurement');
  
    // Add data.
    data.addRows([
      [06:02,1],
      [07:02,1],
      [08:02,2],
      [12:02,15],
      [13:02,2],
      [14:02,1],
      [15:02,1],
      [16:02,1],
      [21:02,2],
  
    ]);
  
      // Create and draw the visualization.
      new google.visualization.LineChart(document.getElementById('visualization')).
          draw(data, {curveType: "function",
                      width: 500, height: 400,
                      vAxis: {maxValue: 10}}
              );
    }
  
  
    google.setOnLoadCallback(drawVisualization);
  </code></pre>
  
  <p></p>
  
  <p>I try <a href="https://developers.google.com/chart/interactive/docs/reference?hl=pl&amp;csw=1#dateformatter" rel="nofollow">google doc</a> but I must be doing something wrong...
  It does'n work... Any idea... </p>