diff --git a/src/blog/index.html b/src/blog/index.html
index 436ac9a..eaee586 100644
--- a/src/blog/index.html
+++ b/src/blog/index.html
@@ -12,7 +12,7 @@ pagination:
         {% for item in pagination.items %}
         <li class="stack-xs">
             <h2><a href="/post/{{ item.slug }}">{{ item.title.rendered | safe }}</a></h2>
-            <time class="block">{{ item.date | parseDate | dateDisplay }}</time>
+            <time class="block" datetime="{{ item.date }}">{{ item.date | parseDate | dateDisplay }}</time>
             {{ item.excerpt.rendered | safe }}
             <a href="/post/{{ item.slug }}" class="inline-block">Read more</a>
         </li>
diff --git a/src/blog/tag.html b/src/blog/tag.html
index cff7604..bb0f6bc 100644
--- a/src/blog/tag.html
+++ b/src/blog/tag.html
@@ -17,7 +17,7 @@ eleventyComputed:
     {% for item in tag.posts %}
     <li class="stack-xs">
         <h2><a href="/post/{{ item.slug }}">{{ item.title.rendered | safe }}</a></h2>
-        <time class="block">{{ item.date | parseDate | dateDisplay }}</time>
+        <time datetime="{{ post.date }}" class="block">{{ item.date | parseDate | dateDisplay }}</time>
         {{ item.excerpt.rendered | safe }}
         <a href="/post/{{ item.slug }}" class="inline-block">Read more</a>
     </li>
diff --git a/src/index.html b/src/index.html
index fbe0630..3ef81cc 100644
--- a/src/index.html
+++ b/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>