Merge branch 'deserialization-date'

lib/mixins/property-accessors.html

@@ -384,6 +384,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
             break;
 
           case Date:
+            value = isNaN(value) ? String(value) : Number(value);
             outValue = new Date(value);
             break;
 

test/unit/property-accessors.html

@@ -113,6 +113,29 @@ suite('property-accessors', function() {
     });
   });
 
+  suite('testing for deserialization of date', function() {
+    let date;
+
+    setup(function() {
+      date = new Date();
+    });
+
+    test('can handle string timestamp', function() {
+      const deserializedDate = window.XFoo.prototype._deserializeValue(String(date.getTime()), Date);
+      assert.equal(deserializedDate.getTime(), date.getTime());
+    });
+
+    test('can handle number timestamp', function() {
+      const deserializedDate = window.XFoo.prototype._deserializeValue(date.getTime(), Date);
+      assert.equal(deserializedDate.getTime(), date.getTime());
+    });
+
+    test('can handle full date', function() {
+      const deserializedDate = window.XFoo.prototype._deserializeValue(date.toString(), Date);
+      assert.equal(deserializedDate.toString(), date.toString());
+    });
+  });
+
 });
 
 </script>