View source  
  <?php
namespace Drupal\role_expire\Plugin\views\field;
use Drupal\views\ViewExecutable;
use Drupal\Core\Form\FormStateInterface;
use Drupal\views\Plugin\views\field\PrerenderList;
use Drupal\role_expire\RoleExpireApiService;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\Core\Datetime\DateFormatterInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
class RoleExpireExpiryData extends PrerenderList {
  
  protected $dateFormatter;
  
  protected $roleExpireApi;
  
  public function __construct(array $configuration, $plugin_id, $plugin_definition, DateFormatterInterface $date_formatter, RoleExpireApiService $role_expire_api) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->dateFormatter = $date_formatter;
    $this->roleExpireApi = $role_expire_api;
  }
  
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container
      ->get('date.formatter'), $container
      ->get('role_expire.api'));
  }
  
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $this->additional_fields['uid'] = [
      'table' => 'users_field_data',
      'field' => 'uid',
    ];
  }
  
  public function query() {
    $this
      ->addAdditionalFields();
    $this->field_alias = $this->aliases['uid'];
  }
  
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['custom_date_format'] = [
      'default' => 'Y-m-d H:i',
    ];
    $options['timezone'] = [
      'default' => '',
    ];
    return $options;
  }
  
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    $form['custom_date_format'] = [
      '#type' => 'textfield',
      '#title' => $this
        ->t('Custom date format'),
      '#description' => $this
        ->t('See <a href="http://us.php.net/manual/en/function.date.php" target="_blank">the PHP docs</a> for date formats.'),
      '#default_value' => isset($this->options['custom_date_format']) ? $this->options['custom_date_format'] : '',
    ];
    $form['timezone'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Timezone'),
      '#description' => $this
        ->t('Timezone to be used for date output.'),
      '#options' => [
        '' => $this
          ->t('- Default site/user timezone -'),
      ] + system_time_zones(FALSE),
      '#default_value' => $this->options['timezone'],
    ];
    parent::buildOptionsForm($form, $form_state);
  }
  
  public function preRender(&$values) {
    $this->items = [];
    if (is_array($values)) {
      $format = $this->options['custom_date_format'];
      $timezone = !empty($this->options['timezone']) ? $this->options['timezone'] : NULL;
      foreach ($values as $user) {
        $expirations = $this->roleExpireApi
          ->getAllUserRecords($user->uid);
        foreach ($expirations as $role => $timestamp) {
          $date = $this->dateFormatter
            ->format($timestamp, 'custom', $format, $timezone);
          $this->items[$user->uid][$role]['expireData'] = $this
            ->t('@role (@date)', [
            '@role' => $role,
            '@date' => $date,
          ]);
        }
      }
    }
  }
  
  public function render_item($count, $item) {
    return $item['expireData'];
  }
}