diff --git a/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs b/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
index db2ca4ea..d583bbf7 100644
--- a/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
+++ b/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
@@ -238,9 +238,7 @@ public class DetectedOperationService : IDetectedOperationService
             positionBegin += 1;
         }
 
-        var lastDate = lastDetectedOperation?.DateEnd ?? detectableTelemetries[positionEnd].DateTime;
-
-        return (lastDate, detectedOperations);
+        return (detectableTelemetries[positionBegin].DateTime, detectedOperations);
     }
 
     public async Task<int> DeleteAsync(DetectedOperationByWellRequest request, CancellationToken token)