diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/scheduler.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/scheduler.tt
index 5779a2a8a9..5e578c2a65 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/scheduler.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/scheduler.tt
@@ -122,6 +122,16 @@
 [% MACRO jsinclude BLOCK %]
     [% Asset.js("js/tools-menu.js") | $raw %]
     [% INCLUDE 'calendar.inc' %]
+    <script>
+        $(document).ready(function () {
+            $("#starttime").on("blur", function () {
+                var time = $(this).val();
+                if (/^\d:\d{2}$/.test(time)) {
+                    $(this).val("0" + time);
+                }
+            });
+        });
+    </script>
 [% END %]
 
 [% INCLUDE 'intranet-bottom.inc' %]