title: Date value on X Axis label achartengine
body: <p><br/>
  i want to use on the X-Axes a set of DataTime values. <br/>
  Using the achartengine, i want to show on it the following objects: <br/></p>
  
  <p>date1, </p>
  
  <ul>
  <li>rain => "value"        </li>
  <li>sun  => "value"</li>
  <li>wind => "value"</li>
  </ul>
  
  <p>date2</p>
  
  <ul>
  <li>rain => "value" </li>
  <li>sun  => "value" </li>
  <li>wind => "value"</li>
  </ul>
  
  <p>etc...</p>
  
  <p>I've already set an achartengine with those values. <br/>
  Here it's my code: </p>
  
  <pre><code>if (mChartView == null){
              layout_chart = (LinearLayout) findViewById(R.id.chart);
              mChartView = ChartFactory.getCombinedXYChartView(
                      Grafico_modello.this
                      , chart.getDataset()//mDataset
                      , chart.getRenderer()//mRenderer
                      , chart.getTypes() //types
                      ); 
      }
  
  //populating the object on the .getDataset method
  for (i=0;i&lt;name_label.length;i++){
      var[i] = new XYSeries(name_label[i]);
          for (j=0;j&lt;grafico.length();j++){
              int unix_time=0;
              unix_time=grafico.getDays()[j];
              var[i].add(unix_time
                      , grafico.getVariabili()
                               .get(unix_time)
                          .get(name_var[i]));
              }
  }
  </code></pre>
  
  <p>UPDATE 1: <img src="https://i.stack.imgur.com/o9CgJ.png" alt="Graphs"></p>