diff --git a/addon/-private/ext/date.js b/addon/-private/ext/date.js
index b15e6a371c2..947341c1b8e 100644
--- a/addon/-private/ext/date.js
+++ b/addon/-private/ext/date.js
@@ -31,7 +31,7 @@ export const parseDate = function (date) {
   // before falling back to any implementation-specific date parsing, so that’s what we do, even if native
   // implementations could be faster
   //              1 YYYY                2 MM       3 DD           4 HH    5 mm       6 ss        7 msec        8 Z 9 ±    10 tzHH    11 tzmm
-  if ((struct = /^(\d{4}|[+\-]\d{6})(?:-(\d{2})(?:-(\d{2}))?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(\d{2})(?:(\d{2}))?)?)?$/.exec(date))) {
+  if ((struct = /^(\d{4}|[+\-]\d{6})(?:-(\d{2})(?:-(\d{2}))?)?(?:T(\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(\d{2}):?(?:(\d{2}))?)?)?$/.exec(date))) {
     // avoid NaN timestamps caused by “undefined” values being passed to Date.UTC
     for (let i = 0, k; (k = numericKeys[i]); ++i) {
       struct[k] = +struct[k] || 0;
diff --git a/tests/unit/transform/date-test.js b/tests/unit/transform/date-test.js
index 6c4a94223ea..bedd2ef009d 100644
--- a/tests/unit/transform/date-test.js
+++ b/tests/unit/transform/date-test.js
@@ -46,9 +46,22 @@ test("#deserialize with different offset formats", function(assert) {
   var dateStringColon = '2013-03-15T23:22:00.000+00:00';
   var dateStringShortOffset = '2016-12-02T17:30:00.000+00';
 
-  assert.equal(transform.deserialize(dateString).getTime(), 1053817200000);
-  assert.equal(transform.deserialize(dateStringShortOffset).getTime(), 1480699800000);
-  assert.equal(transform.deserialize(dateStringColon).getTime(), 1363389720000);
+  assert.expect(6);
+
+  var _dateUTC = Date.UTC;
+
+  try {
+    Date.UTC = function () {
+      assert.equal(arguments.length, 7);
+      return _dateUTC.apply(this, [].slice.call(arguments));
+    };
+
+    assert.equal(transform.deserialize(dateString).getTime(), 1053817200000);
+    assert.equal(transform.deserialize(dateStringShortOffset).getTime(), 1480699800000);
+    assert.equal(transform.deserialize(dateStringColon).getTime(), 1363389720000);
+  } finally {
+    Date.UTC = _dateUTC;
+  }
 });
 
 testInDebug('Ember.Date.parse has been deprecated', function(assert) {