diff --git a/common/test/db_fixtures/bulk_email_flag.json b/common/test/db_fixtures/bulk_email_flag.json
index e4361e7cb8..2e5a2e1d98 100644
--- a/common/test/db_fixtures/bulk_email_flag.json
+++ b/common/test/db_fixtures/bulk_email_flag.json
@@ -5,7 +5,7 @@
         "fields": {
             "enabled": true,
             "require_course_email_auth": false,
-            "change_date": "2016-05-01"
+            "change_date": "2016-05-01T00:00:00Z"
         }
     }
 ]
diff --git a/common/test/db_fixtures/commerce_config.json b/common/test/db_fixtures/commerce_config.json
index 473546f88c..4178a32483 100644
--- a/common/test/db_fixtures/commerce_config.json
+++ b/common/test/db_fixtures/commerce_config.json
@@ -4,7 +4,7 @@
     "model": "commerce.commerceconfiguration",
     "fields": {
       "enabled": 1,
-      "change_date": "2016-04-21 10:19:32.034856"
+      "change_date": "2016-04-21 10:19:32.034856Z"
     }
   }
 ]
diff --git a/common/test/db_fixtures/grades.json b/common/test/db_fixtures/grades.json
index 353e087d2f..7e977d482c 100644
--- a/common/test/db_fixtures/grades.json
+++ b/common/test/db_fixtures/grades.json
@@ -5,7 +5,7 @@
         "fields": {
             "enabled": true,
             "enabled_for_all_courses": true,
-            "change_date": "2016-09-01"
+            "change_date": "2016-09-01T00:00:00Z"
         }
     }
 ]
diff --git a/common/test/db_fixtures/xblock_configuration.json b/common/test/db_fixtures/xblock_configuration.json
index a8d5f338a9..b96905acf4 100644
--- a/common/test/db_fixtures/xblock_configuration.json
+++ b/common/test/db_fixtures/xblock_configuration.json
@@ -6,7 +6,7 @@
             "name": "poll",
             "enabled": true,
             "deprecated": true,
-            "change_date": "2016-07-06"
+            "change_date": "2016-07-06T00:00:00Z"
         }
     },
     {
@@ -16,7 +16,7 @@
             "name": "survey",
             "enabled": true,
             "deprecated": true,
-            "change_date": "2016-07-06"
+            "change_date": "2016-07-06T00:00:00Z"
         }
     }
 ]