Expanded class hierarchy of DateTimeNormalizerTestDrupalDateTime in Drupal 9
- class \Drupal\Component\Datetime\DateTimePlus uses ToStringTrait
- class \Drupal\Core\Datetime\DrupalDateTime uses StringTranslationTrait
- class \Drupal\Tests\serialization\Unit\Normalizer\DateTimeIso8601NormalizerTestDrupalDateTime
- class \Drupal\Tests\serialization\Unit\Normalizer\DateTimeNormalizerTestDrupalDateTime
- class \Drupal\Tests\serialization\Unit\Normalizer\TimestampNormalizerTestDrupalDateTime
- class \Drupal\Core\Datetime\DrupalDateTime uses StringTranslationTrait