Get DateBox to Objece

String fromDate="";
String toDate="";
if(dbFrom.getValue()!=null || dbTo.getValue()!=null)
{
        Date fDate = dbFrom.getValue();
        Date tDate = dbTo.getValue();

        DateTimeFormat fmt = DateTimeFormat.getFormat("yyyyMMdd");
        fromDate =fmt.format(fDate);
        toDate = fmt.format(tDate);
}