diff --git a/sf_machine_connect/controllers/controllers.py b/sf_machine_connect/controllers/controllers.py
index a19b98d9..a6eb4100 100644
--- a/sf_machine_connect/controllers/controllers.py
+++ b/sf_machine_connect/controllers/controllers.py
@@ -1351,7 +1351,7 @@ class Sf_Dashboard_Connect(http.Controller):
                             SELECT DISTINCT ON (alarm_start_time, alarm_time) alarm_time, alarm_start_time
                             FROM device_data
                             WHERE device_name = %s
-                            AND alarm_start_time IS NOT NULL AND alarm_start_time >= %s;
+                            AND alarm_start_time IS NOT NULL AND alarm_start_time::timestamp >= %s;
                         """, (item, time_threshold))
                 results = cur.fetchall()
                 logging.info("results============:%s" % results)