diff --git a/layouts/blog/post.html b/layouts/blog/post.html
index cd07c5395d..3d1afae8e2 100644
--- a/layouts/blog/post.html
+++ b/layouts/blog/post.html
@@ -1,3 +1,3 @@
-<h4 class="date-header">{{ .Date.Format site.Params.time_format_blog }}</h4>
+<h4 class="date-header"><time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format site.Params.time_format_blog }}</time></h4>
 <h3 class="post-title entry-title"><a href="{{ .Permalink }}">{{ .Title }}</a></h3>
 {{ .Content }}