docs: public static Timestamp fromMillis(long epochMilli) {
      long secs = floorDiv(epochMilli, MILLIS_PER_SECOND);
      int mos = (int) floorMod(epochMilli, MILLIS_PER_SECOND);
      return create(secs, (int) (mos * NANOS_PER_MILLI)); // Safe int * NANOS_PER_MILLI
    }