title: Highcharts categorized xAxis datetime - Change scaling from day to month
body: <p>First of all this is my chart:</p>
  
  <pre><code>var options4 = {
          chart: {
              renderTo: '#',
              type: '',
              width: width,
              height: height,
              zoomType: 'x'
          },
  
  
          title: {
              text: '#'
  
  },
  
    subtitle: {
              text: '#'
  },
  
  
  xAxis: {
      type: 'datetime',
      tickinterval: 30,
      categories: []
  },
  
  
          yAxis: [{ // Primary yAxis
              labels: {
                  formatter: function() {
                      return this.value +'%'
                  style: {
                      color: Highcharts.getOptions().colors[1]
                  }
                  }
              },
              title: {
                  text: 'Peakwert 30min',
                  style: {
                      color: Highcharts.getOptions().colors[1]
                  }
              }
          }, { // Secondary yAxis
              title: {
                  text: '',
                  style: {
                      color: Highcharts.getOptions().colors[0]
                  }
              },
              labels: {
                  format: '',
                  style: {
                      color: Highcharts.getOptions().colors[0]
                  }
              },
              opposite: true
          }],
  
  
          tooltip: {
              shared: true
          },
  
          series: []
  
  
  }
  
  $.getJSON("voip/xTas/cpu.php", function(da1) {
      options4.xAxis.categories = da1[0]['data'];
      options4.series[0] = da1[1];
      chart = new Highcharts.Chart(options4);
  });  
  </code></pre>
  
  <p>And this is my PHP:</p>
  
  <pre><code>$category = array();
  $category['name'] = 'Daytime';
  
  
  $series1 = array();
  $series1['name'] = 'LEI3';
  $series1['type'] = 'spline';
  
  
  while($r = mysql_fetch_array($query)) {
      $category['data'][] = $r['dtime'];
      $series1['data'][] = $r['LEI3'];
  
  }
  
  $result = array();
  
  array_push($result,$category);
  array_push($result,$series1);
  </code></pre>
  
  <p>I got a lot of xAxis values that totally destroy the chart if tickinterval is set lower than 30. Actually I want to have monthly x values with zoom to the lower daytime values. I tried setting plotoptions with pointinterval and start, I tried to put pointstart and interval within the PHP, I really tried a lot but I can't make it work.</p>
  
  <p>I got x values from 2013-11-12 00:00:00 to 2014-08-11 00:00:00 and I really want to have x values like January 2014, February 2014 and so on and if you zoom you will find the days.</p>
  
  <p>Is this even possible? </p>