feat(date): Use localized patterns for shorthand format

closes dart-archive#1019

Author: vicb

lib/formatter/date.dart

@@ -7,36 +7,35 @@ part of angular.formatter_internal;
  *
  *     {{ date_expression | date[:format] }}
  *
- * Here `format` may be specified explicitly, or by using one of the following predefined
- * localizable names:
+ * `format` may be specified explicitly, or by using one of the following predefined shorthand:
  *
- *      FORMAT NAME     AS DEFINED FOR en_US             OUTPUT
- *     -------------   ----------------------   ---------------------------
- *      medium          MMM d, y h:mm:ss a       Sep 3, 2010 12:05:08 pm
- *      short           M/d/yy h:mm a            9/3/10 12:05 pm
- *      fullDate        EEEE, MMMM d, y          Friday, September 3, 2010
- *      longDate        MMMM d, y                September 3, 2010
- *      mediumDate      MMM d, y                 Sep 3, 2010
- *      shortDate       M/d/yy                   9/3/10
- *      mediumTime      h:mm:ss a                12:05:08 pm
- *      shortTime       h:mm a                   12:05 pm
+ *      FORMAT NAME        OUTPUT for en_US
+ *     -------------  ---------------------------
+ *      medium         Sep 3, 2010 12:05:08 pm
+ *      short          9/3/10 12:05 pm
+ *      fullDate       Friday, September 3, 2010
+ *      longDate       September 3, 2010
+ *      mediumDate     Sep 3, 2010
+ *      shortDate      9/3/10
+ *      mediumTime     12:05:08 pm
+ *      shortTime      12:05 pm
  *
  *
  * For more on explicit formatting of dates and date syntax, see the documentation for the
- * [DartFormat class](http://api.dartlang.org/docs/releases/latest/intl/DateFormat.html).
+ * [DartFormat class](https://api.dartlang.org/apidocs/channels/stable/dartdoc-viewer/intl/intl.DateFormat).
  *
  */
 @Formatter(name:'date')
 class Date implements Function {
   static final _MAP = const <String, String> {
-    'medium':     'MMM d, y h:mm:ss a',
-    'short':      'M/d/yy h:mm a',
-    'fullDate':   'EEEE, MMMM d, y',
-    'longDate':   'MMMM d, y',
-    'mediumDate': 'MMM d, y',
-    'shortDate':  'M/d/yy',
-    'mediumTime': 'h:mm:ss a',
-    'shortTime':  'h:mm a',
+    'medium':     'yMMMd jms',
+    'short':      'yMd jm',
+    'fullDate':   'yMMMMEEEEd',
+    'longDate':   'yMMMMd',
+    'mediumDate': 'yMMMd',
+    'shortDate':  'yMd',
+    'mediumTime': 'jms',
+    'shortTime':  'jm',
   };
 
   var _dfs = new Map<String, Map<String, DateFormat>>();