Incorrectly displays the time (no leading zero)

private int years; private int month; private int day; private int hour; private int min; ...... tv = (TextView)findViewById(R.id.tv); final Calendar c = Calendar.getInstance(); years = c.get(Calendar.YEAR); month = c.get(Calendar.MONTH); day = c.get(Calendar.DAY_OF_MONTH); min = c.get(Calendar.MINUTE); updateDisplay(); } private void updateDisplay() { // TODO Auto-generated method stub tv.setText( new StringBuilder() .append(month + 1).append("-") .append(day).append("-") .append(years).append(" ") .append(hour).append(":") .append(min).append(" ") );} private String pad(int c) { if (c >= 10) return String.valueOf(c); else return "0" + String.valueOf(c); } }