Convert String date to Calendar. ||| Font: https://developer.android.com/reference/java/util/Calendar.html
String string = "2011-03-09T03:02:10.823Z";
String pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
Date date = new SimpleDateFormat(pattern).parse(string);
System.out.println(date); // Wed Mar 09 03:02:10 BOT 2011
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
// ...