Datetime required format.

Author: loicfrering

index.html

@@ -7,7 +7,7 @@
 
         <header>
             <h1><a href="{{ post.url }}">{{ post.title }}</a></h1>
-            <time class="publishing" data-timestamp="{{ post.date }}" datetime="{{ post.date }}" pubdate="pubdate" title="{{ post.date }}">{{ post.date | date_to_string }}</time>
+            <time class="publishing" datetime="{{ post.date | date:'%Y-%m-%d' }}" pubdate="pubdate" title="{{ post.date | date_to_string }}">{{ post.date | date_to_string }}</time>
             <cite class="author">{{ post.author }}</cite>
         </header>