Controlling bookings system via VBA

[Szwadron6]

Hello,

I would like to ask you for some advice since I am trying to create an application using VBA to control reservation on my werbsite.

My website is: https://tajemniczypokoj.pl/rezerwacje

In order to book a term user needs to click on the specfic date and hour, then giving some information is also required. Though I already have the code to fill Information required for the application (below) I am not quite sure how I could choose the right date. Could you please give me some advice how to control it? I will be very grateful for any hints.

[EDIT] The system does not allow me to publish my source code so I upload it as a file