DateTimeIso8601.php

<?php

namespace Drupal\Core\TypedData\Plugin\DataType;

use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\Attribute\DataType;
use Drupal\Core\TypedData\Type\DateTimeInterface;

/**
 * A data type for ISO 8601 date strings.
 *
 * The plain value of this data type is a date string in ISO 8601 format.
 */
class DateTimeIso8601 extends StringData implements DateTimeInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getDateTime() {
        if ($this->value) {
            if (is_array($this->value)) {
                // Data of this type must always be stored in UTC.
                $datetime = DrupalDateTime::createFromArray($this->value, 'UTC');
            }
            else {
                // Data of this type must always be stored in UTC.
                $datetime = new DrupalDateTime($this->value, 'UTC');
            }
            return $datetime;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function setDateTime(DrupalDateTime $dateTime, $notify = TRUE) {
        $this->value = $dateTime->format('c');
        // Notify the parent of any changes.
        if ($notify && isset($this->parent)) {
            $this->parent
                ->onChange($this->name);
        }
    }

}