TimestampItemNormalizer.php in Drupal 9        
                          
                  
                        
  
  
  
  
File
  core/modules/hal/src/Normalizer/TimestampItemNormalizer.php
  
    View source  
  <?php
namespace Drupal\hal\Normalizer;
use Drupal\Core\Field\FieldItemInterface;
use Drupal\Core\Field\Plugin\Field\FieldType\TimestampItem;
use Drupal\Core\TypedData\Plugin\DataType\Timestamp;
class TimestampItemNormalizer extends FieldItemNormalizer {
  
  protected $supportedInterfaceOrClass = TimestampItem::class;
  
  protected function normalizedFieldValues(FieldItemInterface $field_item, $format, array $context) {
    return parent::normalizedFieldValues($field_item, $format, $context) + [
      
      'format' => \DateTime::RFC3339,
    ];
  }
  
  protected function constructValue($data, $context) {
    if (!empty($data['format'])) {
      $context['datetime_allowed_formats'] = [
        $data['format'],
      ];
    }
    return [
      'value' => $this->serializer
        ->denormalize($data['value'], Timestamp::class, NULL, $context),
    ];
  }
}