diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index bb5f6451..f57c5b6d 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -12,6 +12,10 @@
         Add PeriodDuration, combining Period and Duration.
         See #74.
       </action>
+      <action dev="jodastephen" type="add" >
+        Extend formats Parsed by Interval, allowing years, months, weeks and days.
+        See #70.
+      </action>
       <action dev="jodastephen" type="add" >
         Add Seconds temporal amount class.
         See #73.
diff --git a/src/main/java/org/threeten/extra/Interval.java b/src/main/java/org/threeten/extra/Interval.java
index f4b900fb..d4849c7e 100644
--- a/src/main/java/org/threeten/extra/Interval.java
+++ b/src/main/java/org/threeten/extra/Interval.java
@@ -132,12 +132,11 @@ public static Interval of(Instant startInclusive, Duration duration) {
      * <li>a representations of an {@link OffsetDateTime}, followed by a forward slash,
      *  followed by a representation of a {@link OffsetDateTime}
      * <li>a representation of an {@link OffsetDateTime}, followed by a forward slash,
-     *  followed by a representation of a {@link Duration}
-     * <li>a representation of a {@link Duration}, followed by a forward slash,
+     *  followed by a representation of a {@link PeriodDuration}
+     * <li>a representation of a {@link PeriodDuration}, followed by a forward slash,
      *  followed by a representation of an {@link OffsetDateTime}
      * </ul>
      *
-     *
      * @param text  the text to parse, not null
      * @return the parsed interval, not null
      * @throws DateTimeParseException if the text cannot be parsed
@@ -149,21 +148,21 @@ public static Interval parse(CharSequence text) {
                 char firstChar = text.charAt(0);
                 if (firstChar == 'P' || firstChar == 'p') {
                     // duration followed by instant
-                    Duration duration = Duration.parse(text.subSequence(0, i));
-                    Instant end = OffsetDateTime.parse(text.subSequence(i + 1, text.length())).toInstant();
-                    return Interval.of(end.minus(duration), end);
+                    PeriodDuration amount = PeriodDuration.parse(text.subSequence(0, i));
+                    OffsetDateTime end = OffsetDateTime.parse(text.subSequence(i + 1, text.length()));
+                    return Interval.of(end.minus(amount).toInstant(), end.toInstant());
                 } else {
                     // instant followed by instant or duration
-                    Instant start = OffsetDateTime.parse(text.subSequence(0, i)).toInstant();
+                    OffsetDateTime start = OffsetDateTime.parse(text.subSequence(0, i));
                     if (i + 1 < text.length()) {
                         char c = text.charAt(i + 1);
                         if (c == 'P' || c == 'p') {
-                            Duration duration = Duration.parse(text.subSequence(i + 1, text.length()));
-                            return Interval.of(start, start.plus(duration));
+                            PeriodDuration amount = PeriodDuration.parse(text.subSequence(i + 1, text.length()));
+                            return Interval.of(start.toInstant(), start.plus(amount).toInstant());
                         }
                     }
-                    Instant end = OffsetDateTime.parse(text.subSequence(i + 1, text.length())).toInstant();
-                    return Interval.of(start, end);
+                    OffsetDateTime end = OffsetDateTime.parse(text.subSequence(i + 1, text.length()));
+                    return Interval.of(start.toInstant(), end.toInstant());
                 }
             }
         }
diff --git a/src/test/java/org/threeten/extra/TestInterval.java b/src/test/java/org/threeten/extra/TestInterval.java
index 7a735b70..12415371 100644
--- a/src/test/java/org/threeten/extra/TestInterval.java
+++ b/src/test/java/org/threeten/extra/TestInterval.java
@@ -32,6 +32,7 @@
 package org.threeten.extra;
 
 import static java.time.temporal.ChronoUnit.HOURS;
+import static java.time.temporal.ChronoUnit.MONTHS;
 import static org.testng.Assert.assertEquals;
 import static org.testng.Assert.assertFalse;
 import static org.testng.Assert.assertTrue;
@@ -165,6 +166,12 @@ public void test_parse_CharSequence_DurationInstant() {
         assertEquals(test.getEnd(), NOW2);
     }
 
+    public void test_parse_CharSequence_PeriodDurationInstant() {
+        Interval test = Interval.parse("P6MT5H/" + NOW2);
+        assertEquals(test.getStart(), NOW2.atZone(ZoneOffset.UTC).minus(6, MONTHS).minus(5, HOURS).toInstant());
+        assertEquals(test.getEnd(), NOW2);
+    }
+
     public void test_parse_CharSequence_DurationInstant_caseInsensitive() {
         Interval test = Interval.parse("pt6h/" + NOW2);
         assertEquals(test.getStart(), NOW2.minus(6, HOURS));