Hello Krist
Yes, “Ordinaria” tickets are automatically validated for the selected train. It is unfortunately not possible to change the date and/or departure time with the Trenitalia app, you must call the SBB Contact Center. You need an internet connection to show the QR code.
I suggest to never buy such tickets through SBB. Two solutions:
– Buy a separate Arcobaleno Transfrontaliera ticket from Lugano or the border station, it is valid for 4 hours.
– Buy a separate Trenord ticket from the border station on Trenitalia app.
In both cases the passenger rights are not the same because you don’t have a through ticket.
Kind regards
Danhiel