There is no 30-day pass. You've probably bought a 1-month continuous pass?
Also note that 31 April does not exist.
- There is no need to activate your pass in advance. It is not needed to make reservations.
- 3. In the activation procedure, you can choose the start date of the validity period. If you choose 21 December as the start date, then the last day of validity will be 20 January. The validity period is 31 days in this case. If you choose 1 April as the start date, then the last day of validity will be 30 April.
But it is best not to activate in advance. You never know what happens. If something unexpected happens on your planned start date, and you'd like to postpone travel, then it will be too late to cancel the activation, because that is only possible until midnight CET before the start of validity.
If you want, you can test activation and choose a start date well in the future. After that, please cancel the activation and don't activate again until shortly before boarding your first train.