diff --git a/AsbCloudInfrastructure/Services/TelemetryDataBaseService.cs b/AsbCloudInfrastructure/Services/TelemetryDataBaseService.cs
index ee015db9..c4126196 100644
--- a/AsbCloudInfrastructure/Services/TelemetryDataBaseService.cs
+++ b/AsbCloudInfrastructure/Services/TelemetryDataBaseService.cs
@@ -84,11 +84,15 @@ namespace AsbCloudInfrastructure.Services
                 return default;
 
             if (dateBegin == default)
-                dateBegin = telemetryService.GetLastTelemetryDate(well.IdTelemetry??0);
+            {
+                dateBegin = telemetryService.GetLastTelemetryDate(well.IdTelemetry ?? 0);
+                if (dateBegin != default)
+                    dateBegin = dateBegin.AddSeconds(-intervalSec);
+            }                
 
             if (dateBegin == default)
                 dateBegin = DateTime.Now.AddSeconds(-intervalSec);
-
+            
             if (dateBegin.Kind == DateTimeKind.Unspecified)
                 dateBegin = DateTime.SpecifyKind(dateBegin, DateTimeKind.Utc);