java.time.OffsetDateTime#plusDays(long)
java.time.OffsetDateTime#plusHours(long)
java.time.OffsetDateTime#plusMinutes(long)
java.time.OffsetDateTime#plusMonths(long)
java.time.OffsetDateTime#plusNanos(long)
java.time.OffsetDateTime#plusSeconds(long)
java.time.OffsetDateTime#plusWeeks(long)
java.time.OffsetDateTime#plusYears(long)
java.time.OffsetDateTime#with(java.time.temporal.TemporalAdjuster)

     *
     * @return the current instant using monotonic timing
     */
    @Override
    public Instant instant() {
        long elapsedNanos = System.nanoTime() - startNanos;
        return startInstant.plusNanos(elapsedNanos);
    }

    /**
     * Returns the wall clock time captured when this monotonic clock was initialized.
     * <p>