code: static SingleOffsetTimezone of(ZonalOffset offset) {
  
          if (
              (offset.getIntegralAmount() == 0)
              && (offset.getFractionalAmount() == 0)
          ) {
              return UTC;
          } else {
              return new SingleOffsetTimezone(offset);
          }
  
      }
docs: <p>Fabrikmethode. </p>
  
  @param   offset  fixed shift of local time relative to UTC in seconds