Make Copyright year in footer machine readable

templates/base.html

@@ -50,8 +50,12 @@
         <hr />
         <footer>
             <p>
-                Copyright {{ now() | date(format="%Y", timezone="Europe/Berlin")
-                }} Jonas Tobias Hopusch (<a
+                <!--{% set current_year = now() | date(format="%Y",
+                timezone="Europe/Berlin") %} -->
+
+                Copyright
+                <time datetime="{{ current_year }}">{{ current_year }}</time>
+                Jonas Tobias Hopusch (<a
                     rel="noreferer"
                     href="https://gitlab.com/jotoho"
                     >@jotoho</a