diff --git a/themes/neff/layouts/partials/single.html b/themes/neff/layouts/partials/single.html
index aa8b43b..977a07a 100755
--- a/themes/neff/layouts/partials/single.html
+++ b/themes/neff/layouts/partials/single.html
@@ -17,6 +17,6 @@
 {{- end -}}
 <footer class="single-footer padding">
     <p>
-    <i class="fa fa-calendar"></i> <time datetime="{{ .Lastmod }}">{{ .Lastmod.Format "02.01.2006 15:04" }}</time>
+    <i class="fa fa-calendar"></i> <time datetime='{{ .Lastmod.Format "2006-01-02T15:04-06:00" }}'>{{ .Lastmod.Format "02.01.2006 15:04" }}</time>
     </p>
 </footer>
\ No newline at end of file