Fixed the template of Sitemap and Feed.

feed.xml

@@ -30,8 +30,8 @@ layout: compress
     <title>{{ post.title }}</title>
     <link href="{{ post_absolute_url }}" rel="alternate" type="text/html" title="{{ post.title }}" />
     <published>{{ post.date | date_to_xmlschema }}</published>
-  {% if post.lastmod %}
-    <updated>{{ post.lastmod | date_to_xmlschema }}</updated>
+  {% if post.seo.date_modified %}
+    <updated>{{ post.seo.date_modified | date_to_xmlschema }}</updated>
   {% else %}
     <updated>{{ site.time | date_to_xmlschema }}</updated>
   {% endif %}

sitemap.xml

@@ -10,22 +10,11 @@ layout: compress
 
 <?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+
 {% for post in site.posts %}
-  {% unless post.published == false %}
-
-    {% capture lastmod %}
-      {% if post.seo.date_modified %}
-        {{ post.seo.date_modified }}
-      {% elsif post.date %}
-          {{ post.date }}
-        {% else %}
-          {{ site.time }}
-        {% endif %}
-      {% endcapture %}
-
   <url>
     <loc>{{ site.url | append: site.baseurl | append: post.url }}</loc>
-    <lastmod>{{ lastmod | date_to_xmlschema }}</lastmod>
+    <lastmod>{{ site.time | date_to_xmlschema }}</lastmod>
 
     {% if post.sitemap.changefreq %}
       <changefreq>{{ post.sitemap.changefreq }}</changefreq>
@@ -39,9 +28,6 @@ layout: compress
       <priority>0.5</priority>
     {% endif %}
   </url>
-
-  {% endunless %}
-
 {% endfor %}
 
 {% for page in site.pages %}