docs: private static Timestamp ofEpochSecond(long epochSecond, long nanoAdjustment) {
      long secs = TimeUtils.checkedAdd(epochSecond, floorDiv(nanoAdjustment, NANOS_PER_SECOND));
      int nos = (int) floorMod(nanoAdjustment, NANOS_PER_SECOND);
      return create(secs, nos);
    }