title: Highcharts two date compare
body: <p>I have a chart with two graphs. One last week and another this week.</p>
  
  <pre><code>$('.js-hostChart-'+chart).highcharts
        chart: { type: 'area' }
        title: null
        xAxis:
          type: 'datetime'
          tickInterval: 3600000*2
          title: null
        yAxis:
          title: null
        tooltip:
          shared: true
          crosshairs: true
  </code></pre>
  
  <p>As can be compared to two weeks in a line?</p>