Can't read a cell value from using Jexcel API

Question

I am trying to read a .xls file by JExecel Api. I can read some column data by using cell.getContents() easily. But some column give me mysterious value 1, but column type looks like Date. So i check those column type and Find they are Number Type. So i cast those cell in NumberCell. But output looks still mysterious 1.

Workbook workbook = null;
            try {
                workbook = Workbook.getWorkbook("StandardReport.xls");
                Sheet sheet = workbook.getSheet(0);
                Cell[] cellRow = sheet.getColumn(0);
                for (int row = 4; row < cellRow.length; row++) {
                    String id = cellRow[row].getContents().trim();
                    if (id.isEmpty() == false) {
                        Cell cell1 = sheet.getCell(1, row);
                        Cell cell2 = sheet.getCell(2, row);
                        Cell cell3 = sheet.getCell(3, row);      

                        System.out.println(cell1.getContents()+"");
                        System.out.println(cell2.getContents()+"");
                        System.out.println(cell3.getContents()+"");

                        if (cell3.getType() == CellType.NUMBER) {                                 
                            NumberCell date=(NumberCell)cell3;                                
                            System.out.println(date.getContents()+"");
                        }


                        /*if (cell3.getType() == CellType.BOOLEAN) {
                            System.out.println("2");
                        }
                        if (cell3.getType() == CellType.BOOLEAN_FORMULA) {
                            System.out.println("3");
                        }
                        if (cell3.getType() == CellType.DATE_FORMULA) {
                            System.out.println("4");
                        }
                        if (cell3.getType() == CellType.EMPTY) {
                            System.out.println("5");
                        }
                        if (cell3.getType() == CellType.ERROR) {
                            System.out.println("6");
                        }
                        if (cell3.getType() == CellType.FORMULA_ERROR) {
                            System.out.println("7");
                        }
                        if (cell3.getType() == CellType.LABEL) {
                            System.out.println("8");
                        }
                        if (cell3.getType() == CellType.NUMBER) {
                            System.out.println("9");
                        }
                        if (cell3.getType() == CellType.NUMBER_FORMULA) {
                            System.out.println("11");
                        }
                        if (cell3.getType() == CellType.STRING_FORMULA) {
                            System.out.println("12");
                        }*/

                    }
                }
            } catch (IOException | BiffException ex) {
               StaticAccess.showMessageDialog("Failed!!", ex);
            }

Here is the file link of StandardReport.xls