diff --git a/IRaCIS.Core.Application/Service/Common/Export/TumorExportService.cs b/IRaCIS.Core.Application/Service/Common/Export/TumorExportService.cs
index 1d0efdc85..343b205cf 100644
--- a/IRaCIS.Core.Application/Service/Common/Export/TumorExportService.cs
+++ b/IRaCIS.Core.Application/Service/Common/Export/TumorExportService.cs
@@ -814,6 +814,7 @@ public class Tumor_CDISC_ExportService(IRepository<ReadingQuestionCriterionTrial
                     co.RemarksQuote = $"{co.ArmEnumStr}_VISIT_COMMENTS";
                     co.Remarks = task.VisitNote;
 
+                    co.CODTC = task.SignTime?.ToString("yyyy-MM-dd");
                     coList.Add(co);
                 }