public static String toLocalTime(String unix) {      Long timestamp = Long.parseLong(unix) * 1000;      String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date(timestamp));      return date;  }    public static String toUnixTime(String local){      SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");      String unix = "";      try {          unix = df.parse(local).getTime() + "";      } catch (ParseException e) {          e.printStackTrace();      }      return unix;  }