code: public Calendar getTimeStampDate() {
          if (timeStampToken == null)
              return null;
          Calendar cal = new GregorianCalendar();
          Date date = timeStampToken.getTimeStampInfo().getGenTime();
          cal.setTime(date);
          return cal;
      }
docs: Gets the timestamp date
  @return	a date
  @since	2.1.6