graceguo-supercat commented on a change in pull request #11614:
URL: 
https://github.com/apache/incubator-superset/pull/11614#discussion_r520121851



##########
File path: superset/views/core.py
##########
@@ -1085,8 +1085,14 @@ def save_dash(  # pylint: disable=no-self-use
         DashboardDAO.set_dash_metadata(dash, data)
         session.merge(dash)
         session.commit()
+
+        # get updated changed_on
+        dash = session.query(Dashboard).get(dashboard_id)
+        last_modified_time = dash.changed_on.replace(microsecond=0).timestamp()
         session.close()
-        return json_success(json.dumps({"status": "SUCCESS"}))
+        return json_success(
+            json.dumps({"status": "SUCCESS", "last_modified_time": 
last_modified_time,})

Review comment:
       changed_on is a column name in Dashboards table, its type is `DATETIME`. 
I prefer to use timestamp so that ignore local time etc (maybe different setup 
in each company).




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