public LocalDateTime plus(long amountToAdd, TemporalUnit unit) {

        if (unit instanceof ChronoUnit) {

            ChronoUnit f = (ChronoUnit) unit;

            switch (f) {

                case NANOS: return plusNanos(amountToAdd);

                case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);

                case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);

                case SECONDS: return plusSeconds(amountToAdd);

                case MINUTES: return plusMinutes(amountToAdd);

                case HOURS: return plusHours(amountToAdd);

                case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);  // no overflow (256 is multiple of 2)

            }

            return with(date.plus(amountToAdd, unit), time);

        }

        return unit.addTo(this, amountToAdd);

    }