Formatar campo data-hora em planilha Excel

HSSFCellStyle estilo = wb.createCellStyle();
estilo.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));

public static void main(String[] args) throws IOException {
		 HSSFWorkbook wb = new HSSFWorkbook();
		    HSSFSheet sheet = wb.createSheet("new sheet");

		    // Create a row and put some cells in it. Rows are 0 based.
		    HSSFRow row = sheet.createRow((short)0);

		    // Create a cell and put a date value in it.  The first cell is not styled
		    // as a date.
		    HSSFCell cell = row.createCell((short)0);
		    cell.setCellValue(new Date());

		    // we style the second cell as a date (and time).  It is important to
		    // create a new cell style from the workbook otherwise you can end up
		    // modifying the built in style and effecting not only this cell but other cells.
		    HSSFCellStyle cellStyle = wb.createCellStyle();
		    cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm"));
		    cell = row.createCell((short)1);
		    cell.setCellValue(new Date());
		    cell.setCellStyle(cellStyle);

		    // Write the output to a file
		    FileOutputStream fileOut = new FileOutputStream("workbook.xls");
		    wb.write(fileOut);
		    fileOut.close();

	}