diff --git a/saas/backend/api/management/v2/serializers.py b/saas/backend/api/management/v2/serializers.py
index 5ea8fa0dd..eaad5f30b 100644
--- a/saas/backend/api/management/v2/serializers.py
+++ b/saas/backend/api/management/v2/serializers.py
@@ -167,7 +167,7 @@ class ManagementGroupMemberSLZ(serializers.Serializer):
     id = serializers.CharField(label="成员id")
     name = serializers.CharField(label="名称")
     expired_at = serializers.IntegerField(label="过期时间戳(单位秒)")
-    created_time = serializers.IntegerField(label="创建时间戳(单位秒)")
+    created_at = serializers.IntegerField(label="创建时间戳(单位秒)")
 
 
 class ManagementGroupMemberDeleteSLZ(serializers.Serializer):
diff --git a/saas/backend/api/management/v2/views/group.py b/saas/backend/api/management/v2/views/group.py
index d1dc38134..3f948eaa5 100644
--- a/saas/backend/api/management/v2/views/group.py
+++ b/saas/backend/api/management/v2/views/group.py
@@ -364,7 +364,7 @@ def list(self, request, *args, **kwargs):
         count, group_members = self.biz.list_paging_thin_group_member(group.id, limit, offset)
         results = [one.dict(include={"type", "id", "name", "expired_at", "created_time"}) for one in group_members]
         for result in results:
-            result['created_time'] = int(result['created_time'].timestamp())
+            result['created_at'] = int(result.pop('created_time').timestamp())
         return Response({"count": count, "results": results})
 
     @swagger_auto_schema(
diff --git a/saas/backend/util/time.py b/saas/backend/util/time.py
index a5ce1e893..341e3c6f5 100644
--- a/saas/backend/util/time.py
+++ b/saas/backend/util/time.py
@@ -12,7 +12,6 @@
 import time
 
 from django.utils import timezone
-from dateutil import parser  # type: ignore
 
 
 def string_to_datetime(str_time, fmt="%Y-%m-%d %H:%M:%S"):
@@ -34,8 +33,9 @@ def utc_string_to_timestamp(str_time: str) -> int:
     """
     后端UTC时间转换为时间戳
     """
-    t = parser.isoparse(str_time)
-    return int(t.timestamp())
+    naive_t = string_to_datetime(str_time, fmt="%Y-%m-%dT%H:%M:%SZ")
+    aware_t = naive_t.replace(tzinfo=datetime.timezone.utc)
+    return int(aware_t.timestamp())
 
 
 def utc_to_local(utc_time):