Convert one date format to another

SimpleDateFormat

                    String startDateString = edtTxtDateId.getText().toString();
	            String newDateString = null;
		    DateFormat df = new SimpleDateFormat("yyyy/mm/dd",Locale.ENGLISH);
		    DateFormat sdf = new SimpleDateFormat("mm/dd/yyyy",Locale.ENGLISH); 
		    Date startDate;
		    try {
		        startDate = sdf.parse(startDateString);
		        newDateString = df.format(startDate);
		        System.out.println(newDateString);
		    } catch (ParseException e) {
		        e.printStackTrace();
		    }