diff --git a/app/web/static/index.html b/app/web/static/index.html
index f83d414..d18f048 100644
--- a/app/web/static/index.html
+++ b/app/web/static/index.html
@@ -3252,7 +3252,12 @@ createApp({
         grade:'评价', stance:'立场'};
       const show = x => x == null ? '未知' : Array.isArray(x) ? x.map(show).join('；') :
         typeof x === 'object' ? Object.entries(x).map(([k,v]) => (fields[k] || k) + '：' + show(v)).join('；') : String(x);
-      const when = x => x ? new Date(x).toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' }) + '（北京时间）' : '未知';
+      const when = x => {
+        if (!x) return '未知';
+        if (!/(?:Z|[+-]\d{2}:?\d{2})$/i.test(String(x))) return x + '（时区未记录）';
+        const date = new Date(x);
+        return Number.isNaN(date.getTime()) ? '未知' : date.toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' }) + '（北京时间）';
+      };
       return ['计划版本：' + (d.id || '旧数据，追溯不完整'), '变更原因：' + (d.reason || '未记录'),
         '决策截止：' + when(d.cutoff_at), '独立研究观察：' + when(h.observation_at), '报告生成：' + when(r.report_ran_at),
         ...[['投资论点','thesis'], ['反方论点','antithesis'], ['预期差','expectation'], ['周期位置','cycle'],