Index: src/middleware/render.js
===================================================================
--- src/middleware/render.js	(revision 58cad21190614d41cd361551c6063c848db6d3e1)
+++ src/middleware/render.js	(revision 19e28cedce7ba0de89244415d0c1f285866cd75a)
@@ -108,5 +108,5 @@
 };
 
-const formatDate = (iso) => {
+export const formatDate = (iso) => {
   const d = parseStamp(iso);
   return d ? d.toLocaleDateString('nl-NL', { timeZone: siteTimezone(), day: 'numeric', month: 'long', year: 'numeric' }) : '';