code: public static Moment from(UnixTime ut) {
  
          if (ut instanceof Moment) {
              return (Moment) ut;
          } else if (
              (ut instanceof UniversalTime)
              && LeapSeconds.getInstance().isEnabled()
          ) {
              UniversalTime utc = UniversalTime.class.cast(ut);
              return Moment.of(
                  utc.getElapsedTime(UTC),
                  utc.getNanosecond(UTC),
                  UTC);
          } else {
              return Moment.of(
                  ut.getPosixTime(),
                  ut.getNanosecond(),
                  POSIX);
          }
  
      }
docs: /*[deutsch]
  <p>Allgemeine Konversionsmethode. </p>
  
  @param   ut      UNIX-timestamp
  @return  corresponding {@code Moment}