hasCreatedTime example

if (!$this->hasPublishedStatus()) {
      $definitions['content_translation_status'] = BaseFieldDefinition::create('boolean')
        ->setLabel(t('Translation status'))
        ->setDescription(t('A boolean indicating whether the translation is visible to non-translators.'))
        ->setDefaultValue(TRUE)
        ->setInitialValue(TRUE)
        ->setRevisionable(TRUE)
        ->setTranslatable(TRUE);
    }

    if (!$this->hasCreatedTime()) {
      $definitions['content_translation_created'] = BaseFieldDefinition::create('created')
        ->setLabel(t('Translation created time'))
        ->setDescription(t('The Unix timestamp when the translation was created.'))
        ->setRevisionable(TRUE)
        ->setTranslatable(TRUE);
    }

    if (!$this->hasChangedTime()) {
      $definitions['content_translation_changed'] = BaseFieldDefinition::create('changed')
        ->setLabel(t('Translation changed time'))
        ->setDescription(t('The Unix timestamp when the translation was most recently saved.'))