Try like this:
String date ="29/07/13";
SimpleDateFormat input = new SimpleDateFormat("dd/MM/yy");
SimpleDateFormat output = new SimpleDateFormat("dd MMM yyyy");
try {
oneWayTripDate = input.parse(date); // parse input
tripDate.setText(output.format(oneWayTripDate)); // format output
} catch (ParseException e) {
e.printStackTrace();
}
It's a 2-step process: you first need to parse the existing String into a Date object. Then you need to format the Date object into a new String.