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diff --git a/third_party/protobuf/3.6.0/java/util/src/main/java/com/google/protobuf/util/TimeUtil.java b/third_party/protobuf/3.6.0/java/util/src/main/java/com/google/protobuf/util/TimeUtil.java
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@@ -0,0 +1,400 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.google.protobuf.util;
+
+import com.google.protobuf.Duration;
+import com.google.protobuf.Timestamp;
+
+import java.math.BigInteger;
+import java.text.ParseException;
+
+/**
+ * Utilities to help create/manipulate Timestamp/Duration
+ *
+ * @deprecated Use {@link Durations} and {@link Timestamps} instead.
+ */
+@Deprecated
+public final class TimeUtil {
+  // Timestamp for "0001-01-01T00:00:00Z"
+  public static final long TIMESTAMP_SECONDS_MIN = -62135596800L;
+
+  // Timestamp for "9999-12-31T23:59:59Z"
+  public static final long TIMESTAMP_SECONDS_MAX = 253402300799L;
+  public static final long DURATION_SECONDS_MIN = -315576000000L;
+  public static final long DURATION_SECONDS_MAX = 315576000000L;
+
+  private static final long NANOS_PER_SECOND = 1000000000;
+
+  private TimeUtil() {}
+
+  /**
+   * Convert Timestamp to RFC 3339 date string format. The output will always
+   * be Z-normalized and uses 3, 6 or 9 fractional digits as required to
+   * represent the exact value. Note that Timestamp can only represent time
+   * from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. See
+   * https://www.ietf.org/rfc/rfc3339.txt
+   *
+   * <p>Example of generated format: "1972-01-01T10:00:20.021Z"
+   *
+   * @return The string representation of the given timestamp.
+   * @throws IllegalArgumentException if the given timestamp is not in the
+   *         valid range.
+   * @deprecated Use {@link Timestamps#toString} instead.
+   */
+  @Deprecated
+  public static String toString(Timestamp timestamp) {
+    return Timestamps.toString(timestamp);
+  }
+
+  /**
+   * Parse from RFC 3339 date string to Timestamp. This method accepts all
+   * outputs of {@link #toString(Timestamp)} and it also accepts any fractional
+   * digits (or none) and any offset as long as they fit into nano-seconds
+   * precision.
+   *
+   * <p>Example of accepted format: "1972-01-01T10:00:20.021-05:00"
+   *
+   * @return A Timestamp parsed from the string.
+   * @throws ParseException if parsing fails.
+   * @deprecated Use {@link Timestamps#parse} instead.
+   */
+  @Deprecated
+  public static Timestamp parseTimestamp(String value) throws ParseException {
+    return Timestamps.parse(value);
+  }
+
+  /**
+   * Convert Duration to string format. The string format will contains 3, 6,
+   * or 9 fractional digits depending on the precision required to represent
+   * the exact Duration value. For example: "1s", "1.010s", "1.000000100s",
+   * "-3.100s" The range that can be represented by Duration is from
+   * -315,576,000,000 to +315,576,000,000 inclusive (in seconds).
+   *
+   * @return The string representation of the given duration.
+   * @throws IllegalArgumentException if the given duration is not in the valid
+   *         range.
+   * @deprecated Use {@link Durations#toString} instead.
+   */
+  @Deprecated
+  public static String toString(Duration duration) {
+    return Durations.toString(duration);
+  }
+
+  /**
+   * Parse from a string to produce a duration.
+   *
+   * @return A Duration parsed from the string.
+   * @throws ParseException if parsing fails.
+   * @deprecated Use {@link Durations#parse} instead.
+   */
+  @Deprecated
+  public static Duration parseDuration(String value) throws ParseException {
+    return Durations.parse(value);
+  }
+
+  /**
+   * Create a Timestamp from the number of milliseconds elapsed from the epoch.
+   *
+   * @deprecated Use {@link Timestamps#fromMillis} instead.
+   */
+  @Deprecated
+  public static Timestamp createTimestampFromMillis(long milliseconds) {
+    return Timestamps.fromMillis(milliseconds);
+  }
+
+  /**
+   * Create a Duration from the number of milliseconds.
+   *
+   * @deprecated Use {@link Durations#fromMillis} instead.
+   */
+  @Deprecated
+  public static Duration createDurationFromMillis(long milliseconds) {
+    return Durations.fromMillis(milliseconds);
+  }
+
+  /**
+   * Convert a Timestamp to the number of milliseconds elapsed from the epoch.
+   *
+   * <p>The result will be rounded down to the nearest millisecond. E.g., if the
+   * timestamp represents "1969-12-31T23:59:59.999999999Z", it will be rounded
+   * to -1 millisecond.
+   *
+   * @deprecated Use {@link Timestamps#toMillis} instead.
+   */
+  @Deprecated
+  public static long toMillis(Timestamp timestamp) {
+    return Timestamps.toMillis(timestamp);
+  }
+
+  /**
+   * Convert a Duration to the number of milliseconds.The result will be
+   * rounded towards 0 to the nearest millisecond. E.g., if the duration
+   * represents -1 nanosecond, it will be rounded to 0.
+   *
+   * @deprecated Use {@link Durations#toMillis} instead.
+   */
+  @Deprecated
+  public static long toMillis(Duration duration) {
+    return Durations.toMillis(duration);
+  }
+
+  /**
+   * Create a Timestamp from the number of microseconds elapsed from the epoch.
+   *
+   * @deprecated Use {@link Timestamps#fromMicros} instead.
+   */
+  @Deprecated
+  public static Timestamp createTimestampFromMicros(long microseconds) {
+    return Timestamps.fromMicros(microseconds);
+  }
+
+  /**
+   * Create a Duration from the number of microseconds.
+   *
+   * @deprecated Use {@link Durations#fromMicros} instead.
+   */
+  @Deprecated
+  public static Duration createDurationFromMicros(long microseconds) {
+    return Durations.fromMicros(microseconds);
+  }
+
+  /**
+   * Convert a Timestamp to the number of microseconds elapsed from the epoch.
+   *
+   * <p>The result will be rounded down to the nearest microsecond. E.g., if the
+   * timestamp represents "1969-12-31T23:59:59.999999999Z", it will be rounded
+   * to -1 millisecond.
+   *
+   * @deprecated Use {@link Timestamps#toMicros} instead.
+   */
+  @Deprecated
+  public static long toMicros(Timestamp timestamp) {
+    return Timestamps.toMicros(timestamp);
+  }
+
+  /**
+   * Convert a Duration to the number of microseconds.The result will be
+   * rounded towards 0 to the nearest microseconds. E.g., if the duration
+   * represents -1 nanosecond, it will be rounded to 0.
+   *
+   * @deprecated Use {@link Durations#toMicros} instead.
+   */
+  @Deprecated
+  public static long toMicros(Duration duration) {
+    return Durations.toMicros(duration);
+  }
+
+  /**
+   * Create a Timestamp from the number of nanoseconds elapsed from the epoch.
+   *
+   * @deprecated Use {@link Timestamps#fromNanos} instead.
+   */
+  @Deprecated
+  public static Timestamp createTimestampFromNanos(long nanoseconds) {
+    return Timestamps.fromNanos(nanoseconds);
+  }
+
+  /**
+   * Create a Duration from the number of nanoseconds.
+   *
+   * @deprecated Use {@link Durations#fromNanos} instead.
+   */
+  @Deprecated
+  public static Duration createDurationFromNanos(long nanoseconds) {
+    return Durations.fromNanos(nanoseconds);
+  }
+
+  /**
+   * Convert a Timestamp to the number of nanoseconds elapsed from the epoch.
+   *
+   * @deprecated Use {@link Timestamps#toNanos} instead.
+   */
+  @Deprecated
+  public static long toNanos(Timestamp timestamp) {
+    return Timestamps.toNanos(timestamp);
+  }
+
+  /**
+   * Convert a Duration to the number of nanoseconds.
+   *
+   * @deprecated Use {@link Durations#toNanos} instead.
+   */
+  @Deprecated
+  public static long toNanos(Duration duration) {
+    return Durations.toNanos(duration);
+  }
+
+  /**
+   * Get the current time.
+   *
+   * @deprecated Use {@code Timestamps.fromMillis(System.currentTimeMillis())} instead.
+   */
+  @Deprecated
+  public static Timestamp getCurrentTime() {
+    return Timestamps.fromMillis(System.currentTimeMillis());
+  }
+
+  /**
+   * Get the epoch.
+   *
+   * @deprecated Use {@code Timestamps.fromMillis(0)} instead.
+   */
+  @Deprecated
+  public static Timestamp getEpoch() {
+    return Timestamp.getDefaultInstance();
+  }
+
+  /**
+   * Calculate the difference between two timestamps.
+   *
+   * @deprecated Use {@link Timestamps#between} instead.
+   */
+  @Deprecated
+  public static Duration distance(Timestamp from, Timestamp to) {
+    return Timestamps.between(from, to);
+  }
+
+  /**
+   * Add a duration to a timestamp.
+   *
+   * @deprecated Use {@link Timestamps#add} instead.
+   */
+  @Deprecated
+  public static Timestamp add(Timestamp start, Duration length) {
+    return Timestamps.add(start, length);
+  }
+
+  /**
+   * Subtract a duration from a timestamp.
+   *
+   * @deprecated Use {@link Timestamps#subtract} instead.
+   */
+  @Deprecated
+  public static Timestamp subtract(Timestamp start, Duration length) {
+    return Timestamps.subtract(start, length);
+  }
+
+  /**
+   * Add two durations.
+   *
+   * @deprecated Use {@link Durations#add} instead.
+   */
+  @Deprecated
+  public static Duration add(Duration d1, Duration d2) {
+    return Durations.add(d1, d2);
+  }
+
+  /**
+   * Subtract a duration from another.
+   *
+   * @deprecated Use {@link Durations#subtract} instead.
+   */
+  @Deprecated
+  public static Duration subtract(Duration d1, Duration d2) {
+    return Durations.subtract(d1, d2);
+  }
+
+  // Multiplications and divisions.
+
+  // TODO(kak): Delete this.
+  public static Duration multiply(Duration duration, double times) {
+    double result = duration.getSeconds() * times + duration.getNanos() * times / 1000000000.0;
+    if (result < Long.MIN_VALUE || result > Long.MAX_VALUE) {
+      throw new IllegalArgumentException("Result is out of valid range.");
+    }
+    long seconds = (long) result;
+    int nanos = (int) ((result - seconds) * 1000000000);
+    return normalizedDuration(seconds, nanos);
+  }
+
+  // TODO(kak): Delete this.
+  public static Duration divide(Duration duration, double value) {
+    return multiply(duration, 1.0 / value);
+  }
+
+  // TODO(kak): Delete this.
+  public static Duration multiply(Duration duration, long times) {
+    return createDurationFromBigInteger(toBigInteger(duration).multiply(toBigInteger(times)));
+  }
+
+  // TODO(kak): Delete this.
+  public static Duration divide(Duration duration, long times) {
+    return createDurationFromBigInteger(toBigInteger(duration).divide(toBigInteger(times)));
+  }
+
+  // TODO(kak): Delete this.
+  public static long divide(Duration d1, Duration d2) {
+    return toBigInteger(d1).divide(toBigInteger(d2)).longValue();
+  }
+
+  // TODO(kak): Delete this.
+  public static Duration remainder(Duration d1, Duration d2) {
+    return createDurationFromBigInteger(toBigInteger(d1).remainder(toBigInteger(d2)));
+  }
+
+  private static final BigInteger NANOS_PER_SECOND_BIG_INTEGER =
+      new BigInteger(String.valueOf(NANOS_PER_SECOND));
+
+  private static BigInteger toBigInteger(Duration duration) {
+    return toBigInteger(duration.getSeconds())
+        .multiply(NANOS_PER_SECOND_BIG_INTEGER)
+        .add(toBigInteger(duration.getNanos()));
+  }
+
+  private static BigInteger toBigInteger(long value) {
+    return new BigInteger(String.valueOf(value));
+  }
+
+  private static Duration createDurationFromBigInteger(BigInteger value) {
+    long seconds = value.divide(new BigInteger(String.valueOf(NANOS_PER_SECOND))).longValue();
+    int nanos = value.remainder(new BigInteger(String.valueOf(NANOS_PER_SECOND))).intValue();
+    return normalizedDuration(seconds, nanos);
+  }
+
+  private static Duration normalizedDuration(long seconds, int nanos) {
+    if (nanos <= -NANOS_PER_SECOND || nanos >= NANOS_PER_SECOND) {
+      seconds += nanos / NANOS_PER_SECOND;
+      nanos %= NANOS_PER_SECOND;
+    }
+    if (seconds > 0 && nanos < 0) {
+      nanos += NANOS_PER_SECOND;
+      seconds -= 1;
+    }
+    if (seconds < 0 && nanos > 0) {
+      nanos -= NANOS_PER_SECOND;
+      seconds += 1;
+    }
+    if (seconds < DURATION_SECONDS_MIN || seconds > DURATION_SECONDS_MAX) {
+      throw new IllegalArgumentException("Duration is out of valid range.");
+    }
+    return Duration.newBuilder().setSeconds(seconds).setNanos(nanos).build();
+  }
+}