diff --git a/airflow/models.py b/airflow/models.py
index efe43eded4d..489a2a471e0 100755
--- a/airflow/models.py
+++ b/airflow/models.py
@@ -4406,8 +4406,6 @@ def get_state(self):
     def set_state(self, state):
         if self._state != state:
             self._state = state
-            self.end_date = timezone.utcnow() if self._state in State.finished() else None
-
             if self.dag_id is not None:
                 # something really weird goes on here: if you try to close the session
                 # dag runs will end up detached