diff --git a/b/news/news_article_add.dspy b/b/news/news_article_add.dspy
index 680041d..6fd8518 100644
--- a/b/news/news_article_add.dspy
+++ b/b/news/news_article_add.dspy
@@ -32,8 +32,8 @@ async def news_article_add(ns={}):
         'content_zh': ns.get('content_zh'),
         'content_en': ns.get('content_en'),
         'status': status,
-        'publish_time_zh': ns.get('publish_time_zh'),
-        'publish_time_en': ns.get('publish_time_en'),
+        'publish_time_zh': ns.get('publish_time_zh') or None,
+        'publish_time_en': ns.get('publish_time_en') or None,
         'read_count': 0,
         'del_flg': '0'
     }
diff --git a/b/news/news_article_update.dspy b/b/news/news_article_update.dspy
index ae3d493..4c9bef6 100644
--- a/b/news/news_article_update.dspy
+++ b/b/news/news_article_update.dspy
@@ -14,7 +14,10 @@ async def news_article_update(ns={}):
         'cover_img_zh', 'cover_img_en', 'publish_time_zh', 'publish_time_en'
     ]:
         if field in ns:
-            ns_dic[field] = ns.get(field)
+            if field in ['publish_time_zh', 'publish_time_en']:
+                ns_dic[field] = ns.get(field) or None
+            else:
+                ns_dic[field] = ns.get(field)
     if 'status' in ns:
         if ns.get('status') not in ['0', '1']:
             return {