如何将单元格值设置为“日期”并应用默认的Excel日期格式？

http://poi.apache.org/spreadsheet/quick-
guide.html#CreateDateCells

CellStyle cellStyle = wb.createCellStyle();CreationHelper createHelper = wb.getCreationHelper();cellStyle.setDataFormat(    createHelper.createDataFormat().getFormat("m/d/yy h:mm"));cell = row.createCell(1);cell.setCellValue(new Date());cell.setCellStyle(cellStyle);