diff --git a/_layouts/default.html b/_layouts/default.html
index a47236d..1616a3b 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -32,6 +32,7 @@
 <body itemscope itemtype="http://schema.org/Blog">
     <meta itemprop="isBasedOnUrl" content="https://github.com/mbirth/wiki" />
     <link itemprop="image" href="{{ site.url }}/images/sitelogo.png" />
+    <meta itemprop="datePublished" content="{{ site.time | date: '%Y-%m-%d' }}" />
     <header>
         <div class="container">
             <div id="headerleft">
