Error with date validation

Hello everyone!

I have folloving validation rule on my local development server:

$rules = [ 'cas-od' => 'required|date_format:G:i', 'cas-do' => 'required|date_format:G:i|after:cas-od', ]

and it works perfectliy fine to make sure, that cas-do input must be after cas-od.

But when I copy this code to regular server I get this error after executing validation:

Cannot create dynamic property DateMalformedStringException::$xdebug_message

Do I get this error because of some php date/timezone settings on new server or are there maybe some problems with read/write permissions?