Add datetime attribute to time elements

src/index.html

@@ -26,7 +26,7 @@ layout: base.njk
 
 		<ul class="stack-2xs" role='list'>
 		{% for post in posts | take(3) %}
-			<li><a href="/post/{{ post.slug }}">{{ post.title.rendered | safe }}</a> <time>{{ post.date | dateDisplay }}</time></li>
+			<li><a href="/post/{{ post.slug }}">{{ post.title.rendered | safe }}</a> <time datetime="{{ post.date }}">{{ post.date | dateDisplay }}</time></li>
 		{% endfor %}
 		</ul>