diff --git a/app/models.py b/app/models.py
index 90d4f6e..714826c 100644
--- a/app/models.py
+++ b/app/models.py
@@ -295,9 +295,9 @@ class AlarmEvent(Base):
             "algorithm_code": self.algorithm_code,
             "device_id": self.device_id,
             "scene_id": self.scene_id,
-            "event_time": self.event_time.isoformat() if self.event_time else None,
-            "first_frame_time": self.first_frame_time.isoformat() if self.first_frame_time else None,
-            "last_frame_time": self.last_frame_time.isoformat() if self.last_frame_time else None,
+            "event_time": self.event_time.strftime('%Y-%m-%d %H:%M:%S') if self.event_time else None,
+            "first_frame_time": self.first_frame_time.strftime('%Y-%m-%d %H:%M:%S') if self.first_frame_time else None,
+            "last_frame_time": self.last_frame_time.strftime('%Y-%m-%d %H:%M:%S') if self.last_frame_time else None,
             "duration_ms": self.duration_ms,
             "alarm_level": self.alarm_level,
             "confidence_score": self.confidence_score,
@@ -308,9 +308,9 @@ class AlarmEvent(Base):
             "edge_node_id": self.edge_node_id,
             "handler": self.handler,
             "handle_remark": self.handle_remark,
-            "handled_at": self.handled_at.isoformat() if self.handled_at else None,
-            "created_at": self.created_at.isoformat() if self.created_at else None,
-            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+            "handled_at": self.handled_at.strftime('%Y-%m-%d %H:%M:%S') if self.handled_at else None,
+            "created_at": self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None,
+            "updated_at": self.updated_at.strftime('%Y-%m-%d %H:%M:%S') if self.updated_at else None,
         }
 
 
diff --git a/app/services/alarm_event_service.py b/app/services/alarm_event_service.py
index af83b48..7cbbd02 100644
--- a/app/services/alarm_event_service.py
+++ b/app/services/alarm_event_service.py
@@ -541,11 +541,12 @@ class AlarmEventService:
 
             alarm.duration_ms = duration_ms
 
-            # 解析 last_frame_time
+            # 解析 last_frame_time，去除微秒保持格式一致
             try:
-                alarm.last_frame_time = datetime.fromisoformat(last_frame_time.replace("Z", "+00:00"))
+                parsed_time = datetime.fromisoformat(last_frame_time.replace("Z", "+00:00"))
+                alarm.last_frame_time = parsed_time.replace(microsecond=0)
             except Exception:
-                alarm.last_frame_time = datetime.now(timezone.utc)
+                alarm.last_frame_time = datetime.now(timezone.utc).replace(microsecond=0)
 
             # 如果是人员回岗，标记为自动关闭
             if resolve_type == "person_returned":