--- a/jdk/src/java.base/share/classes/java/util/concurrent/TimeUnit.java	Tue Feb 02 18:15:15 2016 +0300
+++ b/jdk/src/java.base/share/classes/java/util/concurrent/TimeUnit.java	Tue Feb 02 08:53:49 2016 -0800
@@ -35,6 +35,9 @@
 
 package java.util.concurrent;
 
+import java.time.temporal.ChronoUnit;
+import java.util.Objects;
+
 /**
  * A {@code TimeUnit} represents time durations at a given unit of
  * granularity and provides utility methods to convert across units,
@@ -390,4 +393,48 @@
         }
     }
 
+    /**
+     * Converts this {@code TimeUnit} to the equivalent {@code ChronoUnit}.
+     *
+     * @return the converted equivalent ChronoUnit
+     * @since 9
+     */
+    public ChronoUnit toChronoUnit() {
+        switch (this) {
+        case NANOSECONDS:  return ChronoUnit.NANOS;
+        case MICROSECONDS: return ChronoUnit.MICROS;
+        case MILLISECONDS: return ChronoUnit.MILLIS;
+        case SECONDS:      return ChronoUnit.SECONDS;
+        case MINUTES:      return ChronoUnit.MINUTES;
+        case HOURS:        return ChronoUnit.HOURS;
+        case DAYS:         return ChronoUnit.DAYS;
+        default: throw new AssertionError();
+        }
+    }
+
+    /**
+     * Converts a {@code ChronoUnit} to the equivalent {@code TimeUnit}.
+     *
+     * @param chronoUnit the ChronoUnit to convert
+     * @return the converted equivalent TimeUnit
+     * @throws IllegalArgumentException if {@code chronoUnit} has no
+     *         equivalent TimeUnit
+     * @throws NullPointerException if {@code chronoUnit} is null
+     * @since 9
+     */
+    public static TimeUnit of(ChronoUnit chronoUnit) {
+        switch (Objects.requireNonNull(chronoUnit, "chronoUnit")) {
+        case NANOS:   return TimeUnit.NANOSECONDS;
+        case MICROS:  return TimeUnit.MICROSECONDS;
+        case MILLIS:  return TimeUnit.MILLISECONDS;
+        case SECONDS: return TimeUnit.SECONDS;
+        case MINUTES: return TimeUnit.MINUTES;
+        case HOURS:   return TimeUnit.HOURS;
+        case DAYS:    return TimeUnit.DAYS;
+        default:
+            throw new IllegalArgumentException(
+                "No TimeUnit equivalent for " + chronoUnit);
+        }
+    }
+
 }

--- a/jdk/test/java/util/concurrent/tck/TimeUnitTest.java	Tue Feb 02 18:15:15 2016 +0300
+++ b/jdk/test/java/util/concurrent/tck/TimeUnitTest.java	Tue Feb 02 08:53:49 2016 -0800
@@ -41,6 +41,7 @@
 import static java.util.concurrent.TimeUnit.NANOSECONDS;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
+import java.time.temporal.ChronoUnit;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
@@ -456,8 +457,53 @@
      * a deserialized serialized unit is the same instance
      */
     public void testSerialization() throws Exception {
-        TimeUnit x = MILLISECONDS;
-        assertSame(x, serialClone(x));
+        for (TimeUnit x : TimeUnit.values())
+            assertSame(x, serialClone(x));
+    }
+
+    /**
+     * tests for toChronoUnit.
+     */
+    public void testToChronoUnit() throws Exception {
+        assertSame(ChronoUnit.NANOS,   NANOSECONDS.toChronoUnit());
+        assertSame(ChronoUnit.MICROS,  MICROSECONDS.toChronoUnit());
+        assertSame(ChronoUnit.MILLIS,  MILLISECONDS.toChronoUnit());
+        assertSame(ChronoUnit.SECONDS, SECONDS.toChronoUnit());
+        assertSame(ChronoUnit.MINUTES, MINUTES.toChronoUnit());
+        assertSame(ChronoUnit.HOURS,   HOURS.toChronoUnit());
+        assertSame(ChronoUnit.DAYS,    DAYS.toChronoUnit());
+
+        // Every TimeUnit has a defined ChronoUnit equivalent
+        for (TimeUnit x : TimeUnit.values())
+            assertSame(x, TimeUnit.of(x.toChronoUnit()));
+    }
+
+    /**
+     * tests for TimeUnit.of(ChronoUnit).
+     */
+    public void testTimeUnitOf() throws Exception {
+        assertSame(NANOSECONDS,  TimeUnit.of(ChronoUnit.NANOS));
+        assertSame(MICROSECONDS, TimeUnit.of(ChronoUnit.MICROS));
+        assertSame(MILLISECONDS, TimeUnit.of(ChronoUnit.MILLIS));
+        assertSame(SECONDS,      TimeUnit.of(ChronoUnit.SECONDS));
+        assertSame(MINUTES,      TimeUnit.of(ChronoUnit.MINUTES));
+        assertSame(HOURS,        TimeUnit.of(ChronoUnit.HOURS));
+        assertSame(DAYS,         TimeUnit.of(ChronoUnit.DAYS));
+
+        assertThrows(NullPointerException.class,
+                     () -> TimeUnit.of((ChronoUnit)null));
+
+        // ChronoUnits either round trip to their TimeUnit
+        // equivalents, or throw IllegalArgumentException.
+        for (ChronoUnit cu : ChronoUnit.values()) {
+            final TimeUnit tu;
+            try {
+                tu = TimeUnit.of(cu);
+            } catch (IllegalArgumentException acceptable) {
+                continue;
+            }
+            assertSame(cu, tu.toChronoUnit());
+        }
     }
 
 }