title: Jfreechart DateAxis should show date on the top of first tick unit
body: <p>can anyone help me how I could display the date alone on top of the first tick unit of DateAxis in Jfreechart Gantt</p>
  
  <p>Like this:</p>
  
  <p>6july|||7july|||8july|||</p>
  
  <p>valueAxis.setTickUnit(new DateTickUnit(DateTickUnit.HOUR,6));
   ///what needs to be extended here to get the desired format as said above<br>
  valueAxis.setDateFormatOverride(new SimpleDateFormat("'|'d,MMM"));</p>
  
  <p>Thank you.</p>