--- a/jdk/src/java.base/share/classes/java/time/zone/ZoneOffsetTransition.java	Thu Jun 04 15:29:29 2015 +0800
+++ b/jdk/src/java.base/share/classes/java/time/zone/ZoneOffsetTransition.java	Thu Jun 04 10:58:17 2015 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -156,6 +156,7 @@
      * @param offsetAfter  the offset at and after the transition, not null
      */
     ZoneOffsetTransition(LocalDateTime transition, ZoneOffset offsetBefore, ZoneOffset offsetAfter) {
+        assert transition.getNano() == 0;
         this.epochSecond = transition.toEpochSecond(offsetBefore);
         this.transition = transition;
         this.offsetBefore = offsetBefore;
@@ -250,7 +251,7 @@
      * @return the transition instant, not null
      */
     public Instant getInstant() {
-        return transition.toInstant(offsetBefore);
+        return Instant.ofEpochSecond(epochSecond);
     }
 
     /**
@@ -403,13 +404,7 @@
      */
     @Override
     public int compareTo(ZoneOffsetTransition transition) {
-        if (epochSecond < transition.epochSecond) {
-            return -1;
-        } else if (epochSecond > transition.epochSecond) {
-            return 1;
-        } else {
-            return this.getInstant().compareTo(transition.getInstant());
-        }
+        return Long.compare(epochSecond, transition.epochSecond);
     }
 
     //-----------------------------------------------------------------------
@@ -429,7 +424,6 @@
         if (other instanceof ZoneOffsetTransition) {
             ZoneOffsetTransition d = (ZoneOffsetTransition) other;
             return epochSecond == d.epochSecond &&
-                transition.equals(d.transition) &&
                 offsetBefore.equals(d.offsetBefore) && offsetAfter.equals(d.offsetAfter);
         }
         return false;

--- a/jdk/src/java.base/share/classes/java/time/zone/ZoneOffsetTransitionRule.java	Thu Jun 04 15:29:29 2015 +0800
+++ b/jdk/src/java.base/share/classes/java/time/zone/ZoneOffsetTransitionRule.java	Thu Jun 04 10:58:17 2015 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -167,6 +167,7 @@
      * @return the rule, not null
      * @throws IllegalArgumentException if the day of month indicator is invalid
      * @throws IllegalArgumentException if the end of day flag is true when the time is not midnight
+     * @throws IllegalArgumentException if {@code time.getNano()} returns non-zero value
      */
     public static ZoneOffsetTransitionRule of(
             Month month,
@@ -190,6 +191,9 @@
         if (timeEndOfDay && time.equals(LocalTime.MIDNIGHT) == false) {
             throw new IllegalArgumentException("Time must be midnight when end of day flag is true");
         }
+        if (time.getNano() != 0) {
+            throw new IllegalArgumentException("Time's nano-of-second must be zero");
+        }
         return new ZoneOffsetTransitionRule(month, dayOfMonthIndicator, dayOfWeek, time, timeEndOfDay, timeDefnition, standardOffset, offsetBefore, offsetAfter);
     }
 
@@ -220,6 +224,7 @@
             ZoneOffset standardOffset,
             ZoneOffset offsetBefore,
             ZoneOffset offsetAfter) {
+        assert time.getNano() == 0;
         this.month = month;
         this.dom = (byte) dayOfMonthIndicator;
         this.dow = dayOfWeek;

--- a/jdk/test/java/time/tck/java/time/zone/TCKZoneOffsetTransitionRule.java	Thu Jun 04 15:29:29 2015 +0800
+++ b/jdk/test/java/time/tck/java/time/zone/TCKZoneOffsetTransitionRule.java	Thu Jun 04 10:58:17 2015 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -156,6 +156,13 @@
                 OFFSET_0200, OFFSET_0200, OFFSET_0300);
     }
 
+    @Test(expectedExceptions=IllegalArgumentException.class)
+    public void test_factory_nonZeroTimeNanos() {
+        ZoneOffsetTransitionRule.of(
+            Month.MARCH, 20, DayOfWeek.SUNDAY, LocalTime.of(1, 2, 3, 400_000_000),
+            false, TimeDefinition.WALL, OFFSET_0200, OFFSET_0200, OFFSET_0300);
+    }
+
     //-----------------------------------------------------------------------
     // getters
     //-----------------------------------------------------------------------