diff --git a/xinquan/app.py b/xinquan/app.py
index 944d900..e3aac8f 100644
--- a/xinquan/app.py
+++ b/xinquan/app.py
@@ -204,7 +204,9 @@ const state={pages:[], mode:'list', current:null, content:''};
 const umarked = typeof marked==='undefined';
 
 function toast(msg){const t=$('#toast');t.textContent=msg;t.classList.add('show');clearTimeout(t._h);t._h=setTimeout(()=>t.classList.remove('show'),1800);}
-function fmt(ts){ if(!ts)return ''; try{return new Date(ts).toLocaleString('zh-CN');}catch(e){return ts;} }
+function fmt(ts){ if(!ts)return ''; const s=String(ts);
+  const iso=(/Z$/i.test(s)||/([+-]\d{2}:\d{2})$/.test(s))?s:s+'Z';
+  try{return new Date(iso).toLocaleString('zh-CN');}catch(e){return ts;} }
 
 async function loadPages(){
   state.pages = await api('/api/pages');
@@ -532,7 +534,7 @@ class Handler(BaseHTTPRequestHandler):
         with _lock:
             pages = _read_pages()
             pid = uuid.uuid4().hex[:12]
-            now = time.strftime("%Y-%m-%dT%H:%M:%S")
+            now = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
             pages[pid] = {"title": data["title"].strip(),
                           "content": data.get("content", ""),
                           "created": now, "updated": now}
@@ -551,7 +553,7 @@ class Handler(BaseHTTPRequestHandler):
                 pages[pid]["title"] = data["title"].strip()
             if "content" in data:
                 pages[pid]["content"] = data["content"] or ""
-            pages[pid]["updated"] = time.strftime("%Y-%m-%dT%H:%M:%S")
+            pages[pid]["updated"] = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
             _write_pages(pages)
         self._json({"id": pid})