--- old/src/share/classes/java/time/LocalTime.java	2013-07-18 10:20:39.000000000 -0700
+++ new/src/share/classes/java/time/LocalTime.java	2013-07-18 10:20:39.000000000 -0700
@@ -470,8 +470,9 @@
      * Checks if the specified field is supported.
      * <p>
      * This checks if this time can be queried for the specified field.
-     * If false, then calling the {@link #range(TemporalField) range} and
-     * {@link #get(TemporalField) get} methods will throw an exception.
+     * If false, then calling the {@link #range(TemporalField) range},
+     * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)}
+     * methods will throw an exception.
      * <p>
      * If the field is a {@link ChronoField} then the query is implemented here.
      * The supported fields are:
@@ -511,6 +512,43 @@
     }
 
     /**
+     * Checks if the specified unit is supported.
+     * <p>
+     * This checks if the specified unit can be added to, or subtracted from, this date-time.
+     * If false, then calling the {@link #plus(long, TemporalUnit)} and
+     * {@link #minus(long, TemporalUnit) minus} methods will throw an exception.
+     * <p>
+     * If the unit is a {@link ChronoUnit} then the query is implemented here.
+     * The supported units are:
+     * <ul>
+     * <li>{@code NANOS}
+     * <li>{@code MICROS}
+     * <li>{@code MILLIS}
+     * <li>{@code SECONDS}
+     * <li>{@code MINUTES}
+     * <li>{@code HOURS}
+     * <li>{@code HALF_DAYS}
+     * </ul>
+     * All other {@code ChronoUnit} instances will return false.
+     * <p>
+     * If the unit is not a {@code ChronoUnit}, then the result of this method
+     * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)}
+     * passing {@code this} as the argument.
+     * Whether the unit is supported is determined by the unit.
+     *
+     * @param unit  the unit to check, null returns false
+     * @return true if the unit can be added/subtracted, false if not
+     */
+    @Override  // override for Javadoc
+    public boolean isSupported(TemporalUnit unit) {
+        if (unit instanceof ChronoUnit) {
+            return unit.isTimeBased();
+        }
+        return unit != null && unit.isSupportedBy(this);
+    }
+
+    //-----------------------------------------------------------------------
+    /**
      * Gets the range of valid values for the specified field.
      * <p>
      * The range object expresses the minimum and maximum valid values for a field.
@@ -628,7 +666,7 @@
             case CLOCK_HOUR_OF_DAY: return (hour == 0 ? 24 : hour);
             case AMPM_OF_DAY: return hour / 12;
         }
-        throw new UnsupportedTemporalTypeException("Unsupported field: " + field.getName());
+        throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
     }
 
     //-----------------------------------------------------------------------
@@ -803,7 +841,7 @@
                 case CLOCK_HOUR_OF_DAY: return withHour((int) (newValue == 24 ? 0 : newValue));
                 case AMPM_OF_DAY: return plusHours((newValue - (hour / 12)) * 12);
             }
-            throw new UnsupportedTemporalTypeException("Unsupported field: " + field.getName());
+            throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
         }
         return field.adjustInto(this, newValue);
     }
@@ -995,8 +1033,7 @@
     @Override
     public LocalTime plus(long amountToAdd, TemporalUnit unit) {
         if (unit instanceof ChronoUnit) {
-            ChronoUnit f = (ChronoUnit) unit;
-            switch (f) {
+            switch ((ChronoUnit) unit) {
                 case NANOS: return plusNanos(amountToAdd);
                 case MICROS: return plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);
                 case MILLIS: return plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000_000);
@@ -1005,7 +1042,7 @@
                 case HOURS: return plusHours(amountToAdd);
                 case HALF_DAYS: return plusHours((amountToAdd % 2) * 12);
             }
-            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit.getName());
+            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
         }
         return unit.addTo(this, amountToAdd);
     }
@@ -1295,7 +1332,7 @@
      * The result will be negative if the end is before the start.
      * The {@code Temporal} passed to this method must be a {@code LocalTime}.
      * For example, the amount in hours between two times can be calculated
-     * using {@code startTime.periodUntil(endTime, HOURS)}.
+     * using {@code startTime.until(endTime, HOURS)}.
      * <p>
      * The calculation returns a whole number, representing the number of
      * complete units between the two times.
@@ -1307,7 +1344,7 @@
      * The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
      * <pre>
      *   // these two lines are equivalent
-     *   amount = start.periodUntil(end, MINUTES);
+     *   amount = start.until(end, MINUTES);
      *   amount = MINUTES.between(start, end);
      * </pre>
      * The choice should be made based on which makes the code more readable.
@@ -1332,7 +1369,7 @@
      * @throws ArithmeticException if numeric overflow occurs
      */
     @Override
-    public long periodUntil(Temporal endTime, TemporalUnit unit) {
+    public long until(Temporal endTime, TemporalUnit unit) {
         if (endTime instanceof LocalTime == false) {
             Objects.requireNonNull(endTime, "endTime");
             throw new DateTimeException("Unable to calculate amount as objects are of two different types");
@@ -1349,7 +1386,7 @@
                 case HOURS: return nanosUntil / NANOS_PER_HOUR;
                 case HALF_DAYS: return nanosUntil / (12 * NANOS_PER_HOUR);
             }
-            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit.getName());
+            throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
         }
         return unit.between(this, endTime);
     }