Create a date from string and the reverse

AndroidDateFromString.java

String dtStart = "2010-10-15T09:27:37Z";  
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");  
try {  
    Date date = format.parse(dtStart);  
    System.out.println(date);  
} catch (ParseException e) {  
    // TODO Auto-generated catch block  
    e.printStackTrace();  
}

// From Date to String

SimpleDateFormat dateformat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");  
try {  
    Date date = new Date();  
    String datetime = dateFormat.format(date);
    System.out.println("Current Date Time : " + datetime); 
} catch (ParseException e) {  
    // TODO Auto-generated catch block  
    e.printStackTrace();  
}

GetAgeFromDateOfBirth.java

    private int calculateAge(String dateOfBirth) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
        try {
            Date date = format.parse(dateOfBirth);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(date);

            return getAge(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
        } catch (ParseException e) {
            e.printStackTrace();
            Log.d(MainActivity.class.getSimpleName(), e.getMessage());
            return 0;
        }
    }

    public int getAge(int _year, int _month, int _day) {

        GregorianCalendar cal = new GregorianCalendar();
        int y, m, d, a;

        y = cal.get(Calendar.YEAR);
        m = cal.get(Calendar.MONTH);
        d = cal.get(Calendar.DAY_OF_MONTH);
        cal.set(_year, _month, _day);
        a = y - cal.get(Calendar.YEAR);
        if ((m < cal.get(Calendar.MONTH))
                || ((m == cal.get(Calendar.MONTH)) && (d < cal
                .get(Calendar.DAY_OF_MONTH)))) {
            --a;
        }
        if(a < 0)
            throw new IllegalArgumentException("Age < 0");
        return a;
    }