diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
index f380dd9..f6117e4 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter.js
@@ -21,7 +21,7 @@
 
   var TimeFormats = {
     TIME_12: 'h:mm A', // 2:14 PM
-    TIME_24: 'H:mm', // 14:14
+    TIME_24: 'HH:mm', // 14:14
     MONTH_DAY: 'MMM DD', // Aug 29
     MONTH_DAY_YEAR: 'MMM DD, YYYY', // Aug 29, 1997
   };
diff --git a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.html b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.html
index d1886e7..8d65bc3 100644
--- a/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.html
+++ b/polygerrit-ui/app/elements/shared/gr-date-formatter/gr-date-formatter_test.html
@@ -98,13 +98,13 @@
       test('More than 24 hours but less than six months', function(done) {
         testDates('2015-07-29 20:34:14.985000000',
                   '2015-06-15 03:25:14.985000000',
-                  'Jun 15', 'Jun 15, 2015, 3:25', done);
+                  'Jun 15', 'Jun 15, 2015, 03:25', done);
       });
 
       test('More than six months', function(done) {
         testDates('2015-09-15 20:34:00.000000000',
                   '2015-01-15 03:25:00.000000000',
-                  'Jan 15, 2015', 'Jan 15, 2015, 3:25', done);
+                  'Jan 15, 2015', 'Jan 15, 2015, 03:25', done);
       });
     });
 
@@ -174,7 +174,7 @@
       });
 
       test('Default preferences are respected', function() {
-        assert.equal(element._timeFormat, 'H:mm');
+        assert.equal(element._timeFormat, 'HH:mm');
         assert.isFalse(element._relative);
       });
     });