docs: public Seconds toStandardSeconds() {
          checkYearsAndMonths("Seconds");
          long seconds = getMillis() / DateTimeConstants.MILLIS_PER_SECOND;
          seconds = FieldUtils.safeAdd(seconds, getSeconds());
          seconds = FieldUtils.safeAdd(seconds, ((long) getMinutes()) * ((long) DateTimeConstants.SECONDS_PER_MINUTE));
          seconds = FieldUtils.safeAdd(seconds, ((long) getHours()) * ((long) DateTimeConstants.SECONDS_PER_HOUR));
          seconds = FieldUtils.safeAdd(seconds, ((long) getDays()) * ((long) DateTimeConstants.SECONDS_PER_DAY));
          seconds = FieldUtils.safeAdd(seconds, ((long) getWeeks()) * ((long) DateTimeConstants.SECONDS_PER_WEEK));
          return Seconds.seconds(FieldUtils.safeToInt(seconds));
      }