diff --git a/themes/outerspace/layouts/index.html b/themes/outerspace/layouts/index.html
index d97c760..1e77b02 100644
--- a/themes/outerspace/layouts/index.html
+++ b/themes/outerspace/layouts/index.html
@@ -5,7 +5,7 @@
     <article id="{{ .Slug }}" class="teaser-post">
         <h2><a href="{{ .Permalink }}">{{ .Title }}</a></h2>
         <p class="meta">
-        <time class="date">{{ .Date.Format "2 January, 2006" }}</time>
+        <time class="date" datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "2 January, 2006" }}</time>
         • tagged {{ partial "post/tag/list" . }}
         • {{ .WordCount }} words
         • ~{{ .ReadingTime }} minutes
@@ -18,7 +18,7 @@
     <article id="{{ .Slug }}" class="teaser-post">
         <h3><a href="{{ .Permalink }}">{{ .Title }}</a></h3>
         <p class="meta">
-        <time class="date">{{ .Date.Format "2 January, 2006" }}</time>
+        <time class="date" datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "2 January, 2006" }}</time>
         • tagged {{ partial "post/tag/list" . }}
         • {{ .WordCount }} words
         • ~{{ .ReadingTime }} minutes