Hello Nick,

Thanks for your advices, it works fine now with the following. I get inside
my cell date in a good format.

Franck

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 try {
      //ouverture du fichier Excel
      FileOutputStream fileOut;
      POIFSFileSystem fs = new POIFSFileSystem(new
FileInputStream("INVOICE_THIERRY.xls"));

      // creation workbook, sheet et Row 1
      HSSFWorkbook wb = new HSSFWorkbook(fs);
      HSSFSheet sheet = wb.getSheetAt(0);
      HSSFRow row2 = sheet.getRow(1);
      DateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd");

      HSSFDataFormat df = wb.createDataFormat();
      HSSFCellStyle cs = wb.createCellStyle();
      //System.out.println("index of format: " +
df.getFormat("yyyy/MM/dd"));
      cs.setDataFormat(df.getFormat("d-mmm-yy"));

      HSSFCell cellDateM = row2.getCell(5);
      System.out.println("cell date value string = " +
cellDateM.getStringCellValue());

      try {
            Date theDate = dateformat.parse(cellDateM.getStringCellValue());
            System.out.println("theDate = " + dateformat.format(theDate));
            cellDateM.setCellValue(theDate);
            cellDateM.setCellStyle(cs);
        } catch (ParseException e) {
            e.printStackTrace();
            }


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