Fix OG published_time

theme/templates/article.html.nunj

@@ -3,7 +3,7 @@
 {% block head %}
 
   <meta property="og:type" content="article" />
-  <meta property="article:published_time" content="{{ metadata.date.creation }}" />
+  <meta property="article:published_time" content="{{ metadata.date.creation | date }}" />
   {% if metadata.image %} <meta property="og:image" content="{{ metadata.image | absURL( canonicalURL ) }}" /> {% endif %}
   <meta property="og:description" content="{% if metadata.perex %}{{metadata.perex}}{% else %}{% if metadata.perex_e %}{{metadata.perex_e | truncate}}{% else %}{% if content %}{{ content | striptags | truncate }}{% endif %}{% endif %}{% endif %}" />