log4j-core-java9/src/main/java/org/apache/logging/log4j/core/time/MutableInstant.java [44:132]:
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    private long epochSecond;
    private int nanoOfSecond;

    @Override
    public long getEpochSecond() {
        return epochSecond;
    }

    @Override
    public int getNanoOfSecond() {
        return nanoOfSecond;
    }

    @Override
    public long getEpochMillisecond() {
        final int millis = nanoOfSecond / NANOS_PER_MILLI;
        final long epochMillisecond = epochSecond * MILLIS_PER_SECOND + millis;
        return epochMillisecond;
    }

    @Override
    public int getNanoOfMillisecond() {
        final int millis = nanoOfSecond / NANOS_PER_MILLI;
        final int nanoOfMillisecond = nanoOfSecond - (millis * NANOS_PER_MILLI); // cheaper than nanoOfSecond % NANOS_PER_MILLI
        return nanoOfMillisecond;
    }

    public void initFrom(final Instant other) {
        this.epochSecond = other.getEpochSecond();
        this.nanoOfSecond = other.getNanoOfSecond();
    }

    /**
     * Updates the fields of this {@code MutableInstant} from the specified epoch millis.
     * @param epochMilli the number of milliseconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nanoOfMillisecond the number of nanoseconds, later along the time-line, from the start of the millisecond
     */
    public void initFromEpochMilli(final long epochMilli, final int nanoOfMillisecond) {
        validateNanoOfMillisecond(nanoOfMillisecond);
        this.epochSecond = epochMilli / MILLIS_PER_SECOND;
        this.nanoOfSecond = (int) (epochMilli - (epochSecond * MILLIS_PER_SECOND)) * NANOS_PER_MILLI + nanoOfMillisecond;
    }

    private void validateNanoOfMillisecond(final int nanoOfMillisecond) {
        if (nanoOfMillisecond < 0 || nanoOfMillisecond >= NANOS_PER_MILLI) {
            throw new IllegalArgumentException("Invalid nanoOfMillisecond " + nanoOfMillisecond);
        }
    }

    public void initFrom(final Clock clock) {
        if (clock instanceof PreciseClock) {
            ((PreciseClock) clock).init(this);
        } else {
            initFromEpochMilli(clock.currentTimeMillis(), 0);
        }
    }

    /**
     * Updates the fields of this {@code MutableInstant} from the specified instant components.
     * @param epochSecond the number of seconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nano the number of nanoseconds, later along the time-line, from the start of the second
     */
    public void initFromEpochSecond(final long epochSecond, final int nano) {
        validateNanoOfSecond(nano);
        this.epochSecond = epochSecond;
        this.nanoOfSecond = nano;
    }

    private void validateNanoOfSecond(final int nano) {
        if (nano < 0 || nano >= NANOS_PER_SECOND) {
            throw new IllegalArgumentException("Invalid nanoOfSecond " + nano);
        }
    }

    /**
     * Updates the elements of the specified {@code long[]} result array from the specified instant components.
     * @param epochSecond (input) the number of seconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nano (input) the number of nanoseconds, later along the time-line, from the start of the second
     * @param result (output) a two-element array to store the result: the first element is the number of milliseconds
     *               from the Java epoch of 1970-01-01T00:00:00Z,
     *               the second element is the number of nanoseconds, later along the time-line, from the start of the millisecond
     */
    public static void instantToMillisAndNanos(final long epochSecond, final int nano, final long[] result) {
        final int millis = nano / NANOS_PER_MILLI;
        result[0] = epochSecond * MILLIS_PER_SECOND + millis;
        result[1] = nano - (millis * NANOS_PER_MILLI); // cheaper than nanoOfSecond % NANOS_PER_MILLI
    }

    @Override
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log4j-core/src/main/java/org/apache/logging/log4j/core/time/MutableInstant.java [54:142]:
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    private long epochSecond;
    private int nanoOfSecond;

    @Override
    public long getEpochSecond() {
        return epochSecond;
    }

    @Override
    public int getNanoOfSecond() {
        return nanoOfSecond;
    }

    @Override
    public long getEpochMillisecond() {
        final int millis = nanoOfSecond / NANOS_PER_MILLI;
        final long epochMillisecond = epochSecond * MILLIS_PER_SECOND + millis;
        return epochMillisecond;
    }

    @Override
    public int getNanoOfMillisecond() {
        final int millis = nanoOfSecond / NANOS_PER_MILLI;
        final int nanoOfMillisecond = nanoOfSecond - (millis * NANOS_PER_MILLI); // cheaper than nanoOfSecond % NANOS_PER_MILLI
        return nanoOfMillisecond;
    }

    public void initFrom(final Instant other) {
        this.epochSecond = other.getEpochSecond();
        this.nanoOfSecond = other.getNanoOfSecond();
    }

    /**
     * Updates the fields of this {@code MutableInstant} from the specified epoch millis.
     * @param epochMilli the number of milliseconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nanoOfMillisecond the number of nanoseconds, later along the time-line, from the start of the millisecond
     */
    public void initFromEpochMilli(final long epochMilli, final int nanoOfMillisecond) {
        validateNanoOfMillisecond(nanoOfMillisecond);
        this.epochSecond = epochMilli / MILLIS_PER_SECOND;
        this.nanoOfSecond = (int) (epochMilli - (epochSecond * MILLIS_PER_SECOND)) * NANOS_PER_MILLI + nanoOfMillisecond;
    }

    private void validateNanoOfMillisecond(final int nanoOfMillisecond) {
        if (nanoOfMillisecond < 0 || nanoOfMillisecond >= NANOS_PER_MILLI) {
            throw new IllegalArgumentException("Invalid nanoOfMillisecond " + nanoOfMillisecond);
        }
    }

    public void initFrom(final Clock clock) {
        if (clock instanceof PreciseClock) {
            ((PreciseClock) clock).init(this);
        } else {
            initFromEpochMilli(clock.currentTimeMillis(), 0);
        }
    }

    /**
     * Updates the fields of this {@code MutableInstant} from the specified instant components.
     * @param epochSecond the number of seconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nano the number of nanoseconds, later along the time-line, from the start of the second
     */
    public void initFromEpochSecond(final long epochSecond, final int nano) {
        validateNanoOfSecond(nano);
        this.epochSecond = epochSecond;
        this.nanoOfSecond = nano;
    }

    private void validateNanoOfSecond(final int nano) {
        if (nano < 0 || nano >= NANOS_PER_SECOND) {
            throw new IllegalArgumentException("Invalid nanoOfSecond " + nano);
        }
    }

    /**
     * Updates the elements of the specified {@code long[]} result array from the specified instant components.
     * @param epochSecond (input) the number of seconds from the Java epoch of 1970-01-01T00:00:00Z
     * @param nano (input) the number of nanoseconds, later along the time-line, from the start of the second
     * @param result (output) a two-element array to store the result: the first element is the number of milliseconds
     *               from the Java epoch of 1970-01-01T00:00:00Z,
     *               the second element is the number of nanoseconds, later along the time-line, from the start of the millisecond
     */
    public static void instantToMillisAndNanos(final long epochSecond, final int nano, final long[] result) {
        final int millis = nano / NANOS_PER_MILLI;
        result[0] = epochSecond * MILLIS_PER_SECOND + millis;
        result[1] = nano - (millis * NANOS_PER_MILLI); // cheaper than nanoOfSecond % NANOS_PER_MILLI
    }

    @Override
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