diff --git a/themes/patek/layouts/partials/blogPageHeader.html b/themes/patek/layouts/partials/blogPageHeader.html
index 301b3f3..40dac06 100644
--- a/themes/patek/layouts/partials/blogPageHeader.html
+++ b/themes/patek/layouts/partials/blogPageHeader.html
@@ -1,6 +1,6 @@
 <div class="pageHeader">
     <h2 class="title pageTitle"><a href="{{ .Permalink }}">{{ .Title }}</a></h2>
-    <p class="has-text-grey">{{- T "published" -}}:&nbsp;<time>{{ .PublishDate.Format "02.01.2006 15:04" }}</time></p>
+    <p class="has-text-grey">{{- T "published" -}}:&nbsp;<time datetime="{{ .PublishDate.Format "2006-01-02T15:04:05.000-0700" }}">{{ .PublishDate.Format "02.01.2006 15:04" }}</time></p>
     <p class="has-text-grey">
         {{- T "author" -}}: {{ range .Params.authors }}{{ with $.Site.GetPage (printf "authors/%s" .) }}<a class="separateWithCommas" href="{{ .Permalink }}">{{ .Title }}</a>{{ end }}{{ end }}
     </p>
diff --git a/themes/patek/layouts/partials/talksPageHeader.html b/themes/patek/layouts/partials/talksPageHeader.html
index 37ca12f..c4433b5 100644
--- a/themes/patek/layouts/partials/talksPageHeader.html
+++ b/themes/patek/layouts/partials/talksPageHeader.html
@@ -1,7 +1,7 @@
 <div class="pageHeader">
     <h2 class="title pageTitle"><a href="{{ .Permalink }}">{{ .Title }}</a></h2>
-    <p class="has-text-grey-light">{{- T "published" -}}:&nbsp;<time>{{ .PublishDate.Format "02.01.2006 15:04" }}</time></p>
-    <p class="">{{- T "talks-when" -}}:&nbsp;<time>{{ dateFormat "02.01.2006 15:04" .Params.when }}</time></p>
+    <p class="has-text-grey-light">{{- T "published" -}}:&nbsp;<time datetime="{{ .PublishDate.Format "2006-01-02T15:04:05.000-0700" }}">{{ .PublishDate.Format "02.01.2006 15:04" }}</time></p>
+    <p class="">{{- T "talks-when" -}}:&nbsp;<time datetime="{{ dateFormat "2006-01-02T15:04:05.000-0700" .Params.when }}">{{ dateFormat "02.01.2006 15:04" .Params.when }}</time></p>
     <p class="">
         {{- T "presenter" -}}: {{ range .Params.authors }}{{ with $.Site.GetPage (printf "authors/%s" .) }}<a class="separateWithCommas" href="{{ .Permalink }}">{{ .Title }}</a>{{ end }}{{ end }}
     </p>