diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
index 4557ab9..ebab112 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
@@ -255,7 +255,7 @@ public class ClientManService extends OnlBaseService {
 		// 수정 정보
 		credentialUI.setModifiedby(clientEntity.getModifiedby());
 		if (clientEntity.getModifiedon() != null) {
-			credentialUI.setModifiedon(clientEntity.getModifiedon().format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss")));
+			credentialUI.setModifiedon(clientEntity.getModifiedon().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME));
 		}
 
 		// API 목록 변환