Hello Nic90_
Supersaver tickets are only valid for the printed date and selected train. Should you travel on another date or train, a new ticket is required.
Please book your ticket with the correct details and the completely identical route again under sbb.ch/en (or with the application SBB Mobile for mobile cellular phones) and forward us the new order number by e-mail before the departure of the booked train in your former booking.
On receipt, we will cancel the order and refund the amount to your means of payment (this includes a fee of CHF 10.00).
Greetings NadineS