diff --git a/app.py b/app.py
index 51c3bd09..eae07914 100755
--- a/app.py
+++ b/app.py
@@ -13503,8 +13503,12 @@ def create_prediction_topic():
         if not deadline_str:
             return jsonify({'success': False, 'error': '请设置截止时间'}), 400
 
-        # 解析截止时间
+        # 解析截止时间（移除时区信息以匹配数据库格式）
         deadline = datetime.fromisoformat(deadline_str.replace('Z', '+00:00'))
+        # 移除时区信息，转换为naive datetime
+        if deadline.tzinfo is not None:
+            deadline = deadline.replace(tzinfo=None)
+
         if deadline <= beijing_now():
             return jsonify({'success': False, 'error': '截止时间必须在未来'}), 400