diff --git a/_includes/update-list.html b/_includes/update-list.html
index 0ee7b70..0b55225 100644
--- a/_includes/update-list.html
+++ b/_includes/update-list.html
@@ -7,7 +7,7 @@
 {% assign all_list = '' | split: '' %}
 
 {% for post in site.posts %}
-  {% if post.last_modified_at %}
+  {% if post.last_modified_at and post.last_modified_at != post.date %}
     {% capture elem %}
       {{- post.last_modified_at | date: "%Y%m%d%H%M%S" -}}::{{- forloop.index0 -}}
     {% endcapture %}
diff --git a/_layouts/post.html b/_layouts/post.html
index 2296df2..54e0262 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -21,7 +21,7 @@ tail_includes:
     </span>
 
     <!-- lastmod date -->
-    {% if page.last_modified_at %}
+    {% if page.last_modified_at and page.last_modified_at != page.date %}
     <span>
       {{ site.data.locales[lang].post.updated }}
       {% include datetime.html date=page.last_modified_at tooltip=true lang=lang %}