[java] How to read Excel cell having Date with Apache POI?

I'm using Apache POI 3.6, I want to read an excel file which has a date like this 8/23/1991.

 switch (cell.getCellType()) {

   ...
   ...

   case HSSFCell.CELL_TYPE_NUMERIC:
     value = "NUMERIC value=" + cell.getNumericCellValue();
     break;

   ...

 }

But it takes the numeric value type and returns the value like this 33473.0.

I've tried to use Numeric Cell Type although with no luck.

dbltemp=row.getCell(c, Row.CREATE_NULL_AS_BLANK).getNumericCellValue();

if (c == 6 || c == 9) {
    strTemp= new String(dbltemp.toString().trim());

    long tempDate = Long.parseLong(strTemp);
    Date date = new Date(tempDate);

    strVal = date.toString();
}

How can I fix my problem?

You can use CellDateFormatter to fetch the Date in the same format as in excel cell. See the following code:

CellValue cv = formulaEv.evaluate(cell);
double dv = cv.getNumberValue();
if (HSSFDateUtil.isCellDateFormatted(cell)) {
    Date date = HSSFDateUtil.getJavaDate(dv);

    String df = cell.getCellStyle().getDataFormatString();

    strValue = new CellDateFormatter(df).format(date); 
}

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;


Row row = sheet.getRow(0);
Cell cell = row.getCell(0);
if(cell.getCellTypeEnum() == CellType.NUMERIC||cell.getCellTypeEnum() == CellType.FORMULA)
   {
    

 String cellValue=String.valueOf(cell.getNumericCellValue());
     if(HSSFDateUtil.isCellDateFormatted(cell))
      {
          DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
          Date date = cell.getDateCellValue();
          cellValue = df.format(date);
       }
          System.out.println(cellValue);
    }

You need the DateUtils: see this article for details.

Or, better yet, use Andy Khan's JExcel instead of POI.

Yes, I understood your problem. If is difficult to identify cell has Numeric or Data value.

If you want data in format that shows in Excel, you just need to format cell using DataFormatter class.

DataFormatter dataFormatter = new DataFormatter();
String cellStringValue = dataFormatter.formatCellValue(row.getCell(0));
System.out.println ("Is shows data as show in Excel file" + cellStringValue);  // Here it automcatically format data based on that cell format.
// No need for extra efforts 

If you know the cell number, then i would recommend using getDateCellValue() method Here's an example for the same that worked for me - java.util.Date date = row.getCell().getDateCellValue(); System.out.println(date);

For reading date cells this method has proven to be robust so far:

private LocalDate readCellAsDate(final Row row, final int pos) {
    if (pos == -1) {
        return null;
    }
    final Cell cell = row.getCell(pos - 1);
    if (cell != null) {
        cell.setCellType(CellType.NUMERIC);
    } else {
        return null;
    }
    if (DateUtil.isCellDateFormatted(cell)) {
        try {
            return cell.getDateCellValue().toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        } catch (final NullPointerException e) {
            logger.error(e.getMessage());
            return null;
        }
    }
    return null;
}

Try this code.

XSSFWorkbook workbook = new XSSFWorkbook(new File(result));
    XSSFSheet sheet = workbook.getSheetAt(0);

    // Iterate through each rows one by one
    Iterator<Row> rowIterator = sheet.iterator();
    while (rowIterator.hasNext()) {
        Row row = rowIterator.next();
        // For each row, iterate through all the columns
        Iterator<Cell> cellIterator = row.cellIterator();

        while (cellIterator.hasNext()) {
            Cell cell = cellIterator.next();
            switch (cell.getCellType()) {
            case Cell.CELL_TYPE_NUMERIC:
                if (cell.getNumericCellValue() != 0) {
                    //Get date
                    Date date = row.getCell(0).getDateCellValue();



                    //Get datetime
                    cell.getDateCellValue()


                    System.out.println(date.getTime());
                }
                break;
            }
        }
    }

Hope is help.