I am generating an Excel file using Apache POI in Java, and I am formatting some cells to display dates. However, when I open the Excel file and inspect the cells, I notice that the formatted date cells are categorized under Custom instead of Date in Excel

private void createCell(Workbook wb, Sheet sheet, Row row, int columnCount, Object value) {
Cell cell = row.createCell(columnCount);

if (value instanceof Date) {
    // Create a CellStyle for the custom date format
    CellStyle dateCellStyle = wb.createCellStyle();
    CreationHelper createHelper = wb.getCreationHelper();
    
    // Set the custom date format "dd-MM-yyyy"
    dateCellStyle.setDataFormat(createHelper.createDataFormat().getFormat("dd-MM-yyyy"));

    // Set the cell value and apply the style
    cell.setCellValue((Date) value);
    cell.setCellStyle(dateCellStyle);
} else if (value instanceof Integer) {
    cell.setCellValue((Integer) value);
} else if (value instanceof Boolean) {
    cell.setCellValue((Boolean) value);
} else if (value instanceof String) {
    cell.setCellValue((String) value);
} else {
    cell.setCellValue(value != null ? value.toString() : "");
}

}

I need these cells to be categorized under the Date format in Excel.

What I Have Tried:

1. Using different date formats, such as dd-MM-yyyy or MM/dd/yy.

2. Disabling any additional styling to test the behavior with just the date value.

3. Setting locale-specific formats like Locale.US or Locale.UK.

4. Manually inspecting the generated file’s regional settings in Excel.

My Goal:

I want the cells to:

1. Be categorized under Date format instead of Custom in Excel.

Is there a way to ensure that the cells default to the Date format category in Excel? If not, what would be the best way to achieve this?