public class TTest {
    public static void main(String[] args) throws Exception {
            String oldDate="06/09/2004";
            java.text.SimpleDateFormat df = new java.text.SimpleDateFormat("mm/dd/yyyy");
            java.util.Date date=df.parse(oldDate);
            System.out.println("date:"+date);
            df = new java.text.SimpleDateFormat("yyyy-mm-dd");
            String newDate = df.format(date);
            System.out.println("date:"+newDate);
        }
}