Am I entitled to ATV / ADV days?
In principle, the law does not say anything about working hours and working hours reduction, in other words adv or atv days. You can check in your employment contract, personnel guide or collective labor agreement whether specific agreements have been made. In these agreements you can read the number of atv and adv days, and what their status is. For example, it may be agreed that these days are free to take, but also that your employer will include them in your schedule.