Locale format for last sync date

app/assets/javascripts/app/filters/appDate.js

@@ -1,3 +1,6 @@
+// reuse
+var locale, formatter;
+
 angular.module('app')
   .filter('appDate', function ($filter) {
       return function (input) {
@@ -6,6 +9,20 @@ angular.module('app')
   })
   .filter('appDateTime', function ($filter) {
       return function (input) {
+        if (typeof Intl !== 'undefined' && Intl.DateTimeFormat) {
+          if (!formatter) {
+            locale = (navigator.languages && navigator.languages.length) ? navigator.languages[0] : navigator.language;
+            formatter = new Intl.DateTimeFormat(locale, {
+              year: 'numeric',
+              month: 'numeric',
+              day: '2-digit',
+              hour: '2-digit',
+              minute: '2-digit',
+            });
+          }
+          return formatter.format(input);
+        } else {
           return input ? $filter('date')(new Date(input), 'MM/dd/yyyy h:mm a') : '';
-      };
+        }
+      }
   });