drupalcampbristol/web/core/modules/rdf/src/CommonDataConverter.php

<?php

namespace Drupal\rdf;

/**
 * Contains methods for common data conversions.
 */
class CommonDataConverter {

  /**
   * Provides a passthrough to place unformatted values in content attributes.
   *
   * @param mixed $data
   *   The data to be placed in the content attribute.
   *
   * @return mixed
   *   Returns the data.
   */
  public static function rawValue($data) {
    return $data;
  }

  /**
   * Converts a date entity field array into an ISO 8601 timestamp string.
   *
   * @param array $data
   *   The array containing the 'value' element.
   *
   * @return string
   *   Returns the ISO 8601 timestamp.
   */
  public static function dateIso8601Value($data) {
    return \Drupal::service('date.formatter')->format($data['value'], 'custom', 'c', 'UTC');
  }

}