diff --git a/php/public/timezone.js b/php/public/timezone.js
index b43bdfe7..cd926587 100644
--- a/php/public/timezone.js
+++ b/php/public/timezone.js
@@ -2,6 +2,6 @@ document.addEventListener("DOMContentLoaded", function(event) {
     // timezone
     let timezone = document.getElementById("timezone");
     if (timezone) {
-        timezone.value = Intl.DateTimeFormat().resolvedOptions().timeZone
+        timezone.placeholder = Intl.DateTimeFormat().resolvedOptions().timeZone
     }
 });
diff --git a/php/templates/containers.twig b/php/templates/containers.twig
index adfe3161..063e28ce 100644
--- a/php/templates/containers.twig
+++ b/php/templates/containers.twig
@@ -24,7 +24,7 @@
             <script type="text/javascript" src="second-tab-warning.js"></script>
 
             {# timezone-prefill #}
-            <script type="text/javascript" src="timezone.js"></script>
+            <script type="text/javascript" src="timezone.js?v1"></script>
 
             {# js for optional containers and additional containers forms #}
             <script type="text/javascript" src="containers-form-submit.js?v7"></script>