diff --git a/frontend/src/stimulus/controllers/dynamic/time-entry.controller.ts b/frontend/src/stimulus/controllers/dynamic/time-entry.controller.ts
new file mode 100644
index 000000000000..35a1287e46ec
--- /dev/null
+++ b/frontend/src/stimulus/controllers/dynamic/time-entry.controller.ts
@@ -0,0 +1,44 @@
+/*
+ * -- copyright
+ * OpenProject is an open source project management software.
+ * Copyright (C) the OpenProject GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 3.
+ *
+ * OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+ * Copyright (C) 2006-2013 Jean-Philippe Lang
+ * Copyright (C) 2010-2013 the ChiliProject Team
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * See COPYRIGHT and LICENSE files for more details.
+ * ++
+ */
+
+import { Controller } from '@hotwired/stimulus';
+
+export default class TimeEntryController extends Controller {
+  static targets = ['startTimeInput', 'endTimeInput', 'hoursInput'];
+
+  declare readonly startTimeInputTarget:HTMLInputElement;
+  declare readonly endTimeInputTarget:HTMLInputElement;
+  declare readonly choursInputTarget:HTMLInputElement;
+
+  startTimeInputTargetConnected() {
+    // console.log('We have a start input');
+    this.startTimeInputTarget.value = '12:00';
+  }
+}
diff --git a/modules/costs/app/components/time_entries/entry_dialog_component.html.erb b/modules/costs/app/components/time_entries/entry_dialog_component.html.erb
index fc783e2b8452..c53510ac2725 100644
--- a/modules/costs/app/components/time_entries/entry_dialog_component.html.erb
+++ b/modules/costs/app/components/time_entries/entry_dialog_component.html.erb
@@ -1,4 +1,4 @@
-<%= render(Primer::Alpha::Dialog.new(title: 'Log Time', size: :large, id: MODAL_ID)) do |d| %>
+<%= render(Primer::Alpha::Dialog.new(title: 'Log Time', size: :large, id: MODAL_ID, data: { "controller" => "time-entry",  "application-target" => "dynamic" })) do |d| %>
   <% d.with_header(variant: :large, mb: 3) %>
   <%= render(TimeEntries::TimeEntryFormComponent.new(time_entry: time_entry)) %>
 <% end %>
diff --git a/modules/costs/app/components/time_entries/time_entry_form.rb b/modules/costs/app/components/time_entries/time_entry_form.rb
index 09d6879cf479..f7291a1e3de8 100644
--- a/modules/costs/app/components/time_entries/time_entry_form.rb
+++ b/modules/costs/app/components/time_entries/time_entry_form.rb
@@ -8,7 +8,9 @@ class TimeEntryForm < ApplicationForm
       end
       f.text_field name: :spent_on, label: "Date"
       f.group(layout: :horizontal) do |g|
-        g.text_field name: :start_time, label: "Start time"
+        g.text_field name: :start_time,
+                     label: "Start time",
+                     data: { "time-entry-target" => "startTimeInput" }
         g.text_field name: :end_time, label: "Finish time"
       end
       f.text_field name: :hours, label: "Hours"