How update value which run from strong params??

I have action(strong parameters) in controller:

def home_task_params
     params.require(:home_task).permit(:subject, :description, :data)
end

i want do something similar to this

def create
@home_task = HomeTask.create(:subject => home_task_params.subject, :description => home_task_params.description, :day => home_task_params.data,
 :data => home_task_params.data, :class_room => current_user.class_room )
 end

I need it because I want to modify the data before recording to the database?
How do i implement it???TY

I think you want do run a callback: https://guides.rubyonrails.org/active_record_callbacks.html