Java Android Retrofit inheritance problem?

Question

Java

Dear gurus, tell the newbie how to solve the problem.
I receive different object models in response to different requests to the server as a retrofit. all objects in the same view (string) store the date of the meeting, the other fields are different. I drive the collection that I get into a method that parses the date string in the way I need and writes it to the custom fields I need.
Because the date string is always the same. How to make it so that there is one method for all answers, respectively, and different models. The problem is what I was trying to do through inheritance. Declared the superclass from which it inherited. But in this case, the retrofit praser crashes with the error "Unable to create converter for class"
I tried to add the necessary methods to the body of the setter in each response class, like I parse the string and stuff the values ​​\u200b\u200bthat I need. But the seter is not called on response. There is no access to the server. Service is not mine
How to make beautiful?

Answer 1

and where about inheritance? the fact that the classes have the same field does not give grounds for such high-profile statements.
how to do? for each answer its essence.

Answer 2

How to make beautiful?
don't know but effective www.jsonschema2pojo.org