fix(date filter): display localised era for G format code

This implementation is limited to displaying AD years correctly only, since
there is no agreed standard on how to represent dates before 1 AD.

Closes #10503

Author: petebacondarwin

src/ng/filter/filters.js

@@ -302,6 +302,10 @@ function ampmGetter(date, formats) {
   return date.getHours() < 12 ? formats.AMPMS[0] : formats.AMPMS[1];
 }
 
+function eraGetter(date, formats) {
+  return date.getFullYear() <= 0 ? formats.ERAS[0] : formats.ERAS[1];
+}
+
 var DATE_FORMATS = {
   yyyy: dateGetter('FullYear', 4),
     yy: dateGetter('FullYear', 2, 0, true),
@@ -328,10 +332,11 @@ var DATE_FORMATS = {
      a: ampmGetter,
      Z: timeZoneGetter,
     ww: weekGetter(2),
-     w: weekGetter(1)
+     w: weekGetter(1),
+     G: eraGetter
 };
 
-var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZEw']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|d+|H+|h+|m+|s+|a|Z|w+))(.*)/,
+var DATE_FORMATS_SPLIT = /((?:[^yMdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|d+|H+|h+|m+|s+|a|Z|w+))(.*)/,
     NUMBER_STRING = /^\-?\d+$/;
 
 /**

test/ng/filter/filtersSpec.js

@@ -229,7 +229,7 @@ describe('filters', function() {
     });
   });
 
-  describe('date', function() {
+  ddescribe('date', function() {
 
     var morning  = new angular.mock.TzDate(+5, '2010-09-03T12:05:08.001Z'); //7am
     var noon =     new angular.mock.TzDate(+5, '2010-09-03T17:05:08.012Z'); //12pm
@@ -298,6 +298,9 @@ describe('filters', function() {
 
       expect(date(earlyDate, "MMMM dd, y")).
                       toEqual('September 03, 1');
+
+      expect(date(noon, "MMMM dd, y G")).
+                      toEqual('September 03, 2010 AD');
     });
 
     it('should accept negative numbers as strings', function() {