try {
  // creates destination file
  File file = new File("test.xlsx");

  // creates date cells custom style settings
  CellStyle dateCellStyle = workbook.createCellStyle();
  dateCellStyle.setFillForegroundColor(IndexedColors.AQUA.getIndex());
  dateCellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
  dateCellStyle.setDataFormat(workbook.getCreationHelper().createDataFormat().getFormat("yyyy/MM/dd"));

  // creates MemPOI using its builder and requests the export
  MempoiBuilder.aMemPOI()
    .withWorkbook(workbook)
    .withFile(file)
    .addMempoiSheet(new MempoiSheet(prepStmt))
    .withStyleTemplate(new AquaStyleTemplate())
    .withNumberCellStyle(workbook.createCellStyle())         // to remove default style you can just override it with a new empty one
    .withDateCellStyle(dateCellStyle)                        // override default date cell style with the new one
    .build()
    .prepareMempoiReportToFile()
    .get();

} catch (ExecutionException e) {
  System.out.println(e.getCause().getMessage());
} catch (InterruptedException e) {
  e.printStackTrace();
}