title: Date Format with hours, minutes and seconds in C3JS
body: <p>I try to run the following code to display dates with minutes and seconds, what am I missing here ?</p>
  
  <p>The graph does not display and the X axis is not properly displayed.</p>
  
  <p>Thank you</p>
  
  <pre><code>var chart = c3.generate({
      data: {
          x: 'x',
          columns: [
              ['x', '2017-01-01 12:10:00', '2017-01-02 05:00:00', '2017-01-03 03:00:00', '2017-01-04 03:00:00',
              '2017-01-05 03:00:00.000',
              '2017-01-06 03:00:00.000'],
              ['data1', 0.5, 0.5, null, null, null, null],
              ['data2', null, 0.5, 0.5, 0.5, 0.5, null],
              ['data3', null, null, null, null, 0.5, 0.5],
  
          ],
      },
      axis: {
          x: {
              type: 'timeseries',
              tick: {
                  format: '%Y-%m-%d %H:%M:%S'
              }
          }
      }
  });
  </code></pre>