FormatDate.java

public class FormatDate {
  private static CellStyle getFormatAsDate(Workbook workbook) {
		CreationHelper creationHelper = workbook.getCreationHelper();
		CellStyle cellStyle = workbook.createCellStyle();
		cellStyle.setDataFormat(creationHelper.createDataFormat().getFormat("dddd dd/MM/yyyy hh:mm:ss"));
		return cellStyle;
	}
}