diff --git a/app/assets/javascripts/admin/util.js.erb b/app/assets/javascripts/admin/util.js.erb
index 4bc9132c43..cc5f32f843 100644
--- a/app/assets/javascripts/admin/util.js.erb
+++ b/app/assets/javascripts/admin/util.js.erb
@@ -12,7 +12,7 @@ $(document).ready(function() {
     altInput: true,
     altFormat: Spree.translations.flatpickr_date_format,
     dateFormat: "Y-m-d",
-    locale: I18n.locale,
+    locale: I18n.base_locale,
     plugins: [
         ShortcutButtonsPlugin({
           button: [{
diff --git a/app/views/layouts/_i18n_script.html.haml b/app/views/layouts/_i18n_script.html.haml
index 70cfafba83..504579d81e 100644
--- a/app/views/layouts/_i18n_script.html.haml
+++ b/app/views/layouts/_i18n_script.html.haml
@@ -1,5 +1,6 @@
 :javascript
   I18n.default_locale = "#{I18n.default_locale}";
+  I18n.base_locale = "#{I18n.locale.to_s.split('_').first}";
   I18n.locale = "#{I18n.locale}";
   I18n.fallbacks = true;
   moment.locale([I18n.locale, 'en']);