code: @Override
      @SuppressWarnings("unchecked")
      public ChronoZonedDateTime<Symmetry454Date> zonedDateTime(Instant instant, ZoneId zone) {
          return (ChronoZonedDateTime<Symmetry454Date>) super.zonedDateTime(instant, zone);
      }
docs: Obtains a Symmetry454 zoned date-time in this chronology from an {@code Instant}.
  
  @param instant  the instant to create the date-time from, not null
  @param zone  the time-zone, not null
  @return the Symmetry454 zoned date-time, not null
  @throws DateTimeException if the result exceeds the supported range