Hi, there,
I am planning to travel in Switzerland around 8 days in May 2019, and will buy a one-month Half-fare travelcard.
I will buy the Saver Day Passes with Half-fare Travelcard and 60 days before departure in order to get the cheapest price.
Could you advise if I need to have the valid Half-fare Travelcard when the day I buy the ticket, or only when the day I travel.