Fixes date field validation message presents in reverse order

modules/localgov_forms_date/config/install/core.date_format.localgov_forms_date_datetime.yml

@@ -0,0 +1,7 @@
+langcode: en
+status: true
+dependencies: {  }
+id: localgov_forms_date_datetime
+label: 'LocalGOV Forms Datetime'
+locked: false
+pattern: 'd-m-Y\TH:i:sO'

modules/localgov_forms_date/config/install/core.date_format.localgov_forms_date_short_date.yml

@@ -0,0 +1,7 @@
+langcode: en
+status: true
+dependencies: {  }
+id: localgov_forms_date_short_date
+label: 'LocalGOV Forms Short Date'
+locked: false
+pattern: d-m-Y

modules/localgov_forms_date/localgov_forms_date.install

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the LocalGov Forms Date module.
+ */
+
+use Drupal\Component\Serialization\Yaml;
+
+/**
+ * Adds a UK short date style e.g dd-mm-yyyy.
+ */
+function localgov_forms_date_update_8001() {
+  $config_id = 'core.date_format.localgov_forms_date_short_date';
+  $config_path = \Drupal::service('extension.list.module')->getPath('localgov_forms_date');
+  $uk_short_html_date_config = Yaml::decode(file_get_contents($config_path . '/config/install/' . $config_id . '.yml'));
+  \Drupal::configFactory()->getEditable($config_id)->setData($uk_short_html_date_config)->save();
+}
+
+/**
+ * Adds a UK short date style e.g dd-mm-yyyy HH:mm:ss.
+ */
+function localgov_forms_date_update_8002() {
+  $config_id = 'core.date_format.localgov_forms_date_datetime';
+  $config_path = \Drupal::service('extension.list.module')->getPath('localgov_forms_date');
+  $uk_html_datetime_config = Yaml::decode(file_get_contents($config_path . '/config/install/' . $config_id . '.yml'));
+  \Drupal::configFactory()->getEditable($config_id)->setData($uk_html_datetime_config)->save();
+}

modules/localgov_forms_date/src/Plugin/WebformElement/LocalgovFormsDate.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\localgov_forms_date\Plugin\WebformElement;
 
+use Drupal\Core\Datetime\Entity\DateFormat;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\webform\Plugin\WebformElement\DateList;
 
@@ -119,4 +120,23 @@ public function setDefaultValue(array &$element) {
     $element['#type'] = $orig_type;
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * Overrides the Datebase class so that
+   * date validation error messages display in
+   * a UK Style format e.g dd-mm-yyyy.
+   */
+  public static function validateDate(&$element, FormStateInterface $form_state, &$complete_form) {
+
+    // Adds a  short date and short date time format.
+    $localgov_forms_short_date_format = DateFormat::load('localgov_forms_date_short_date')->getPattern();
+    $localgov_forms_datetime_format = DateFormat::load('localgov_forms_date_datetime')->getPattern();
+
+    $element['#date_date_format'] = $localgov_forms_short_date_format;
+    $element['#date_time_format'] = $localgov_forms_datetime_format;
+
+    parent::validateDate($element, $form_state, $complete_form);
+  }
+
 }

modules/localgov_forms_date/tests/src/Kernel/DateWebformElementTest.php

@@ -95,6 +95,8 @@ protected function setUp() :void {
     $this->installConfig('system');
     $this->installConfig('localgov_forms_date_test');
 
+    $this->installConfig('localgov_forms_date');
+
     $empty_submission = WebformSubmission::create(['webform_id' => 'date_test']);
     $this->testForm = WebformSubmissionForm::create($this->container);
     $this->testForm->setEntityTypeManager($this->container->get('entity_type.manager'));