reference_date-1.0.x-dev/reference_date.views.inc

<?php

/**
 * @file
 * Provides views data for the reference_date module.
 */

use Drupal\field\FieldStorageConfigInterface;

/**
 * Implements hook_field_views_data().
 */
function reference_date_field_views_data(FieldStorageConfigInterface $field_storage) {

  // Include datetime.views.inc file in order for helper function
  // datetime_type_field_views_data_helper() to be available.
  \Drupal::moduleHandler()->loadInclude('datetime', 'inc', 'datetime.views');

  // Get datetime field data for value and end_value.
  $data = datetime_type_field_views_data_helper($field_storage, [], 'value');
  $data = datetime_type_field_views_data_helper($field_storage, $data, 'end_value');

  return $data;
}