code: public long realTimeInMicros() {
  
          if (this.monotonic || MONOTON_MODE) {
              return Math.floorDiv(this.utcNanos(), 1000);
          } else {
              long millis = System.currentTimeMillis();
              long utc = LeapSeconds.getInstance().enhance(Math.floorDiv(millis, 1000));
              return Math.multiplyExact(utc, MIO) + Math.floorMod(millis, 1000) * 1000;
          }
  
      }
docs: /*[deutsch]
  <p>Liefert die aktuelle seit [1972-01-01T00:00:00,000000Z] verstrichene
  UTC-Zeit in Mikrosekunden. </p>
  
  @return  count of microseconds since UTC epoch including leap seconds
  @see     #currentTimeInMicros()
  @since   3.2/4.1