title: How to display Date in a X-axis of Line Graph using Jfreechart
body: <p>I am trying to display a Line Graph with Time(HH:MM:SS) as X-axis and Number(as Y-Axis). 
  The read data from "Time" column is of the format HH:MM:SS. 
  The way i am populating dataset from which chart is construted is as follows</p>
  
  <pre><code>for (Row row : sheet)
  {
      Double sar_Val = poiGetCellValue(sar);
      Double date_val = poiGetCellValue(date);
  
      if(sar_Val != null &amp;&amp; date_val != null)
      {
          series1.add(date_val,sar_Val);
      }
      dataset.addSeries(series1);
  }
  </code></pre>
  
  <p>//poiGetCellValue in the above code returns a double based on the data type</p>
  
  <p>Problem is that i have to convert the data under "Time" column which is in format HH:MM:SS to some double value and populate the series1 since add function take only double values. How to display the time in X-Axis once i have converted the value to double 
  Or is there any other method to add to XYseries?</p>