diff --git a/themes/grid/layout/partial/post/list.ejs b/themes/grid/layout/partial/post/list.ejs
index 49ba07f..310ef0d 100644
--- a/themes/grid/layout/partial/post/list.ejs
+++ b/themes/grid/layout/partial/post/list.ejs
@@ -8,7 +8,7 @@
             </h3>
             <div class="flex row-a col-n rm-start-a">
                 <div class="uk-text-meta mr-1">发布：<%= date(post.date, "YYYY-MM-DD HH:mm") %></div>
-                <% let updateValid = moment(post.update).isValid() %>
+                <% let updateValid = typeof(post.update) == 'string' %>
                 <div class="uk-text-meta mr-1">更新：<%= date(updateValid ? post.update : post.date, "YYYY-MM-DD HH:mm") %></div>
                 <% if (post.categories.length> 0) { %>
                     <div class="uk-text-meta">知识分类：