title: Apache poi date format
body: <p>Hi i am reading csv file and getting date in 01-01-2011 but i want it in 01-Jan-2011 format when i write .xlsx file using apache poi library. my code is </p>
  
  <pre><code>XSSFDataFormat df = workBook.createDataFormat();
  cs.setDataFormat(df.getFormat("dd-MMM-yy"));
  </code></pre>
  
  <p>but it is not working for me. where am i doing mistake.</p>