diff --git a/src/datetime/tests.rs b/src/datetime/tests.rs
index d0fd16ded7..24a5fde981 100644
--- a/src/datetime/tests.rs
+++ b/src/datetime/tests.rs
@@ -751,6 +751,11 @@ fn test_parse_datetime_utc() {
         "2001-02-03T04:05:06+0000",
         "2001-02-03T04:05:06-00:00",
         "2001-02-03T04:05:06-01:00",
+        "2001-02-03T04:05:06-01: 00",
+        "2001-02-03T04:05:06-01 :00",
+        "2001-02-03T04:05:06-01 : 00",
+        "2001-02-03T04:05:06-01 :     00",
+        "2001-02-03T04:05:06-01 :    :00",
         "2012-12-12T12:12:12Z",
         "2015-02-18T23:16:09.153Z",
         "2015-2-18T23:16:09.153Z",