code: public static String expires() {
          DateTime dt = new DateTime(DateTimeZone.UTC).plusMinutes(15);
          return valueOf(dt.getMillis() / 1000L);
      }
docs: Generates the expires value needed to add to episodic requests.
  <p/>
  The current number of seconds since epoch (January 1, 1970).
  <p/>
  I hacked this with a 1 day buffer because of problems with timezones etc.
  
  @return The current number of seconds since the epoch;