Java 如何从时间对象中删除日期？

我试图使用ApachePOI在excel单元格中节省时间[hh:mm:ss]。我所写的守则如下：

  FileOutputStream out = new FileOutputStream("dateFormat.xls");
  HSSFWorkbook hssfworkbook = new HSSFWorkbook();
  HSSFSheet sheet = hssfworkbook.createSheet("new sheet");
  HSSFCellStyle cs = hssfworkbook.createCellStyle();
  HSSFDataFormat df = hssfworkbook.createDataFormat();
  cs.setDataFormat(df.getFormat("h:mm:ss"));
  HSSFRow row = sheet.createRow((short)0);
  HSSFCell cell = row.createCell((short)0);
  //cell.setCellValue(new Time(567898));
  cell.setCellValue(new Time(1, 6, 55));
  cell.setCellStyle(cs);
  hssfworkbook.write(out);
  out.close();

现在的问题是，它包括日期和时间。当我对excel表格中由该代码生成的单元格进行求和时。它给出的

结果不正确

 cell.setCellValue(new Time(3, 4, 4));  --->01-01-1970  03:04:04 AM [in excel sheet]
 cell2.setCellValue(new Time(1, 6, 51)); --->01-01-1970  01:06:55 AM [in excel sheet]

另一种方法是，我尝试给出
String
值，在本例中，结果是
Zero
，您需要设置单元格的样式，以使格式正常工作：

cell.setStyle(cs);

此问题的工作代码为：

  FileOutputStream out = new FileOutputStream("dateFormat.xls");
  HSSFWorkbook hssfworkbook = new HSSFWorkbook();
  HSSFSheet sheet = hssfworkbook.createSheet("new sheet");
  HSSFCellStyle cs = hssfworkbook.createCellStyle();
  HSSFDataFormat df = hssfworkbook.createDataFormat();
  HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(hssfworkbook);

  cs.setDataFormat(df.getFormat("h:mm:ss"));
  HSSFRow row = sheet.createRow((short)0);
  HSSFCell cell = row.createCell((short)0);


  cell.setCellFormula("TIME(0,3,24)");//this method only sets the formula string and does not calculate the formula value
  cell.setCellType(Cell.CELL_TYPE_FORMULA);//Set the cells type (numeric, formula or string)

  evaluator.evaluateFormulaCell(cell);// it evaluates the formula, and saves the result of the formula
  cell.setCellStyle(cs);



  HSSFRow row2 = sheet.createRow((short)1);
  HSSFCell cell2 = row2.createCell((short)0);


  cell2.setCellFormula("TIME(0,9,54)");
  cell2.setCellType(Cell.CELL_TYPE_FORMULA);
  evaluator.evaluateFormulaCell(cell2);
  cell2.setCellStyle(cs);

感谢您的回答，我忘了提到我已经在代码中编写了
cell.setStyle（cs）
。你能推荐一些其他的解决方案吗。