title: Highcharts setExtremes() does not display the correct interval for one day
body: <p>I have a chart that by default displays yearly data. 
  I also have 3 buttons that allows me to zoomIn/Out on specific intervals (yearly/weekly/daily). I do this by setting a specific interval on <strong>setExtremes()</strong> function.
  E.g: weekly:</p>
  
  <pre><code>$('#weeklyView').click(function () {
     var chart = $('.chart-stor').highcharts();
          chart.xAxis[0].setExtremes(
              Date.UTC(2015, 0, 5),
              Date.UTC(2015, 0, 12)
          );
      });
  </code></pre>
  
  <p>Weekly interval selection works perfectly. However when I do the same for daily view it displays data for about 5 days and not only for the day selected:</p>
  
  <pre><code>$('#dailyView').click(function () {
          var chart = $('.chart-stor').highcharts();
          chart.xAxis[0].setExtremes(
              Date.UTC(2015, 6, 1),
              Date.UTC(2015, 6, 1)
          );
     });
  </code></pre>
  
  <p>How exactly should I proceed to make sure that the chart displays the exact range I set using setExtremes() function, on daily view?</p>