docs: public static Seconds secondsBetween(ReadablePartial start, ReadablePartial end) {
          if (start instanceof LocalTime && end instanceof LocalTime)   {
              Chronology chrono = DateTimeUtils.getChronology(start.getChronology());
              int seconds = chrono.seconds().getDifference(
                      ((LocalTime) end).getLocalMillis(), ((LocalTime) start).getLocalMillis());
              return Seconds.seconds(seconds);
          }
          int amount = BaseSingleFieldPeriod.between(start, end, ZERO);
          return Seconds.seconds(amount);
      }