--- /dev/null
+<?php
+
+namespace Drupal\system\Form;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Locale\CountryManagerInterface;
+use Drupal\Core\Form\ConfigFormBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Configure regional settings for this site.
+ */
+class RegionalForm extends ConfigFormBase {
+
+ /**
+ * The country manager.
+ *
+ * @var \Drupal\Core\Locale\CountryManagerInterface
+ */
+ protected $countryManager;
+
+ /**
+ * Constructs a RegionalForm object.
+ *
+ * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+ * The factory for configuration objects.
+ * @param \Drupal\Core\Locale\CountryManagerInterface $country_manager
+ * The country manager.
+ */
+ public function __construct(ConfigFactoryInterface $config_factory, CountryManagerInterface $country_manager) {
+ parent::__construct($config_factory);
+ $this->countryManager = $country_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('config.factory'),
+ $container->get('country_manager')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'system_regional_settings';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getEditableConfigNames() {
+ return ['system.date'];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $countries = $this->countryManager->getList();
+ $system_date = $this->config('system.date');
+
+ // Date settings:
+ $zones = system_time_zones();
+
+ $form['locale'] = [
+ '#type' => 'details',
+ '#title' => t('Locale'),
+ '#open' => TRUE,
+ ];
+
+ $form['locale']['site_default_country'] = [
+ '#type' => 'select',
+ '#title' => t('Default country'),
+ '#empty_value' => '',
+ '#default_value' => $system_date->get('country.default'),
+ '#options' => $countries,
+ '#attributes' => ['class' => ['country-detect']],
+ ];
+
+ $form['locale']['date_first_day'] = [
+ '#type' => 'select',
+ '#title' => t('First day of week'),
+ '#default_value' => $system_date->get('first_day'),
+ '#options' => [0 => t('Sunday'), 1 => t('Monday'), 2 => t('Tuesday'), 3 => t('Wednesday'), 4 => t('Thursday'), 5 => t('Friday'), 6 => t('Saturday')],
+ ];
+
+ $form['timezone'] = [
+ '#type' => 'details',
+ '#title' => t('Time zones'),
+ '#open' => TRUE,
+ ];
+
+ $form['timezone']['date_default_timezone'] = [
+ '#type' => 'select',
+ '#title' => t('Default time zone'),
+ '#default_value' => $system_date->get('timezone.default') ?: date_default_timezone_get(),
+ '#options' => $zones,
+ ];
+
+ $configurable_timezones = $system_date->get('timezone.user.configurable');
+ $form['timezone']['configurable_timezones'] = [
+ '#type' => 'checkbox',
+ '#title' => t('Users may set their own time zone'),
+ '#default_value' => $configurable_timezones,
+ ];
+
+ $form['timezone']['configurable_timezones_wrapper'] = [
+ '#type' => 'container',
+ '#states' => [
+ // Hide the user configured timezone settings when users are forced to use
+ // the default setting.
+ 'invisible' => [
+ 'input[name="configurable_timezones"]' => ['checked' => FALSE],
+ ],
+ ],
+ ];
+ $form['timezone']['configurable_timezones_wrapper']['empty_timezone_message'] = [
+ '#type' => 'checkbox',
+ '#title' => t('Remind users at login if their time zone is not set'),
+ '#default_value' => $system_date->get('timezone.user.warn'),
+ '#description' => t('Only applied if users may set their own time zone.')
+ ];
+
+ $form['timezone']['configurable_timezones_wrapper']['user_default_timezone'] = [
+ '#type' => 'radios',
+ '#title' => t('Time zone for new users'),
+ '#default_value' => $system_date->get('timezone.user.default'),
+ '#options' => [
+ DRUPAL_USER_TIMEZONE_DEFAULT => t('Default time zone'),
+ DRUPAL_USER_TIMEZONE_EMPTY => t('Empty time zone'),
+ DRUPAL_USER_TIMEZONE_SELECT => t('Users may set their own time zone at registration'),
+ ],
+ '#description' => t('Only applied if users may set their own time zone.')
+ ];
+
+ return parent::buildForm($form, $form_state);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $this->config('system.date')
+ ->set('country.default', $form_state->getValue('site_default_country'))
+ ->set('first_day', $form_state->getValue('date_first_day'))
+ ->set('timezone.default', $form_state->getValue('date_default_timezone'))
+ ->set('timezone.user.configurable', $form_state->getValue('configurable_timezones'))
+ ->set('timezone.user.warn', $form_state->getValue('empty_timezone_message'))
+ ->set('timezone.user.default', $form_state->getValue('user_default_timezone'))
+ ->save();
+
+ parent::submitForm($form, $form_state);
+ }
+
+}