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');
    }

}