update published_articles_monitor improve

published_articles_monitor.py

@@ -45,7 +45,7 @@ def monitor_article(article):
                         "gh_id": gh_id,
                         "title": title,
                         "wx_sn": wx_sn.decode("utf-8"),
-                        "publish_date": publish_date,
+                        "publish_date": str(publish_date),
                         "error_detail": error_detail,
                     }
                 )