code: public boolean isPositiveLS(long utc) {
  
          if (utc <= 0) {
              return false;
          }
  
          final ExtendedLSE[] events = this.getEventsInDescendingOrder();
  
          for (int i = 0; i < events.length; i++) {
              long comp = events[i].utc();
  
              if (comp == utc) {
                  return (events[i].getShift() == 1);
              } else if (comp < utc) {
                  break;
              }
          }
  
          return false;
  
      }
docs: /*[deutsch]
  <p>Ist die angegebene UTC-Zeit eine registrierte positive
  Schaltsekunde? </p>
  
  @param   utc     elapsed SI-seconds relative to UTC epoch
  [1972-01-01T00:00:00Z] including leap seconds
  @return  {@code true} if the argument represents a registered
  positive leap second else {@code false}