If you have a round-trip ticket, you can choose to depart with any train on your selected departure date and return anytime within 31 days after your departure.
For example, if you purchase a round-trip ticket with departure on 1 August, you can depart with any train on 1 August and return anytime between 1 and 31 August.
If you plan on taking the train at 00:00 to catch a flight that departs, for example, on 1 August, we recommend that you put 1 August as your train departure date. If you put 31 July as your departure date, your ticket will be valid only until 02:00, 1 August.