Call to a member function humanize() on string

Hi,

I'm getting the error when i humnize() a datetime string from my database. same working for created_at field but not working for doc_expiry_date

Code:

  <?= $doc->doc_expiry->humanize(); ?>

Date :

Code:

2023-09-15 11:16:37

See var_dump($doc->doc_expiry)
Instance of Time() class?