Cannot normalize attribute "timezone" because injected serializer is not a normalizer

Question

Can't normalize DateTime onject in php (Symfony)... Why it doesn't work? DateTime is the object, isn't it?
$normalizers->normalize($patient->getDateAdded())
Error: Cannot normalize attribute "timezone" because injected serializer is not a normalizer

Answer 1

You must inject serializer into normalizer. Use $normalizer->setSerializer($this->get('))