// Create a new workbook Workbook workbook = new Workbook(); IWorksheet worksheet = workbook.getWorksheets().get(0); worksheet.getRange("C2:E4").setValue(new Object[][]{ {new GregorianCalendar(2020, 11, 1), new GregorianCalendar(2020, 11, 14), new GregorianCalendar(2020, 11, 15)}, {new GregorianCalendar(2020, 11, 18), new GregorianCalendar(2020, 11, 19), new GregorianCalendar(2020, 11, 30)}, {new GregorianCalendar(2020, 11, 31), new GregorianCalendar(2019, 11, 13), new GregorianCalendar(2019, 11, 15)}, }); //create date validation. worksheet.getRange("C2:E4").getValidation().add(ValidationType.Date, ValidationAlertStyle.Stop, ValidationOperator.Between, new GregorianCalendar(2020, 11, 13), new GregorianCalendar(2020, 11, 18)); //set column width just for export shown. worksheet.getRange("C:E").getEntireColumn().setColumnWidthInPixel(120); //judge if Range["C2:E4"] has validation. for (int i = 1; i <= 3; i++) { for (int j = 2; j <= 4; j++) { if (worksheet.getRange(i, j).getHasValidation()) { //set the range[i, j]'s interior color. worksheet.getRange(i, j).getInterior().setColor(Color.GetLightBlue()); } } } // Save to an excel file workbook.save("CreateDateValidation.xlsx");