diff --git a/FrontendWebApi/ApiControllers/HistoryController.cs b/FrontendWebApi/ApiControllers/HistoryController.cs
index 867a1b4..792507e 100644
--- a/FrontendWebApi/ApiControllers/HistoryController.cs
+++ b/FrontendWebApi/ApiControllers/HistoryController.cs
@@ -156,7 +156,7 @@ namespace FrontendWebApi.ApiControllers
                                 hed.type = devicePoint.Where(x => x.device_building_tag == d.building_tag && x.points == ard["@point"].ToString()).Select(x => x.full_name).FirstOrDefault();
                                 hed.deviceName = device.Where(x => x.device_number == ard["@device_number"].ToString()).Select(x => x.full_name).FirstOrDefault();
                                 hed.value = (double)((decimal)ard["@avg_rawdata"]);
-                                hed.timestamp = Convert.ToDateTime(ard["@end_timestamp"].ToString());
+                                hed.timestamp = Convert.ToDateTime(ard["@start_timestamp"].ToString());
                                 hed.building_tag = d.building_tag;
                                 he.Add(hed);
                             }