code: @Override
      public long until(Temporal endExclusive, TemporalUnit unit) {
          Objects.requireNonNull(endExclusive, "endExclusive");
          @SuppressWarnings("unchecked")
          ChronoZonedDateTime<D> end = (ChronoZonedDateTime<D>) getChronology().zonedDateTime(endExclusive);
          if (unit instanceof ChronoUnit) {
              end = end.withZoneSameInstant(offset);
              return dateTime.until(end.toLocalDateTime(), unit);
          }
          Objects.requireNonNull(unit, "unit");
          return unit.between(this, end);
      }
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