If you travel to Barcelona, stay there for 2 days and the travel to Malaga, that is 2 travel days. A travel day is 00.00 - 23.59 CET.
As you haven't started you travel yet I would like to give you some advice from the experienced travellers in the Community.
Here is some useful information from the experienced travellers in the Community regarding both planning, reservations and activation of pass and travel days.
Planning
The rail planner is normally not up to date, as it only is updated once a month, so to be sure of the time table you better check the timetable and availability on the websites of the national railways. The bigger national railways, like DB (Germany) SBB (Switzerland) and ÖBB (Austria) cover several countries.
Reservations
The advice from the experienced travellers in the community is to use other ways to make reservations than the Interrail/Eurail website. You can look at the guide in the link:
https://community.eurail.com/train-connections-reservations-47/how-to-get-reservations-105
If you, after having looked at the guide, have questions about how to make specific reservation, please give your travel details (departure date, time and route) preferably in a new topic, and you will get advice.
Please note that Interrail/Eurail charges an extra fee of 2 EUR per person and ticket in addition to the fee for the seat reservation.
Activation of pass
During the activation process, when you choose the start day of the validity of the pass, the first day of the validity period is automatically made a travel day, even if you don't enter a journey, the advice is therefore not to activate the pass before the first travel day as you only can deactivate the pass before 00.00 on the day the validity starts. If your travel plans change in the last moment you will loose travel days if you have activated the pass in advance.
It can be wise to make a test and activate the pass with a start date well in the future and then deactivate the pass immediately, just to see that everything works.
Activation of travel day
The advice from the experienced travellers in the community is also never to activate a travel day, that is connect a journey to your pass, until just before boarding the train, otherwise you might loose a travel day if your travel plans change in a late stage You can't delete a travel day in the past. A travel day can only be deleted until 23.59 CET the day before the travel day.
Aviso: it should be obvious to buy ticket for the shortest/cheapest sector. In this case this is Port BOu-Bcn on Cercanias/rodalies/Cat-express-NOT use the direct TGV/AVE from MOntpellier-this also saves you quite a lot of money. OR use a bus-blabla or flix from Perpignan to Barca.
And good luck for finding seat on the directo Bcn-Mlg-buy you hablemo ES and can do it locally weeks ahead-other as all the other passholders who want always this train.
