diff --git a/src/tests/control/test_utils.py b/src/tests/control/test_utils.py
new file mode 100644
index 0000000000..14c5ef8c89
--- /dev/null
+++ b/src/tests/control/test_utils.py
@@ -0,0 +1,15 @@
+from pretix.base.i18n import language
+from pretix.control.utils.i18n import get_javascript_format, get_moment_locale
+
+
+def test_js_formats():
+    with language('de'):
+        assert get_javascript_format('DATETIME_INPUT_FORMATS') == 'DD.MM.YYYY HH:mm:ss'
+    with language('en'):
+        assert get_javascript_format('DATETIME_INPUT_FORMATS') == 'YYYY-MM-DD HH:mm:ss'
+
+
+def test_get_locale():
+    get_moment_locale('af') == 'af'
+    get_moment_locale('de_Informal') == 'de'
+    get_moment_locale('de-AT') == 'de'