diff --git a/kallithea/model/db.py b/kallithea/model/db.py
--- a/kallithea/model/db.py
+++ b/kallithea/model/db.py
@@ -2139,6 +2139,8 @@ class PullRequest(Base, BaseDbModel):
             status=self.status,
             comments=self.comments,
             statuses=self.statuses,
+            created_on=self.created_on.replace(microsecond=0),
+            updated_on=self.updated_on.replace(microsecond=0),
         )
 
     def url(self, **kwargs):
diff --git a/kallithea/tests/api/api_base.py b/kallithea/tests/api/api_base.py
--- a/kallithea/tests/api/api_base.py
+++ b/kallithea/tests/api/api_base.py
@@ -2467,6 +2467,8 @@ class _BaseTestApi(object):
             "statuses": [{"status": "under_review", "reviewer": base.TEST_USER_ADMIN_LOGIN, "modified_at": "2000-01-01T00:00:00"} for i in range(0, len(self.TEST_PR_REVISIONS))],
             "title": "get test",
             "revisions": self.TEST_PR_REVISIONS,
+            "created_on": "2000-01-01T00:00:00",
+            "updated_on": "2000-01-01T00:00:00",
         }
         self._compare_ok(random_id, expected,
                          given=re.sub(br"\d\d\d\d\-\d\d\-\d\dT\d\d\:\d\d\:\d\d",