Hi, when buying Swiss Travel Pass Flex, does the the start of validity date have to be the first day of usage?. As my plan is quite fluid and I am there more than the 15 days, I want to use the Pass economically, so I may not validate it on my first day of arrival, since I am buying the Flex pass. Eg. If I state validity from 25 June, but only plan to validate on 27 June, is that possible? Or do I already have to decide which is the first day of my validation?
Thanks for answering.