Judgment of the Court (Second Chamber) of 11 April 2019.#Syndicat des cadres de la sécurité intérieure v Premier ministre and Others.#Request for a preliminary ruling from the Conseil d'État.#Reference for a preliminary ruling — Directive 2003/88/EC — Organisation of working time — Protection of the safety and health of workers — Maximum weekly working time — Reference period — Rolling or fixed nature — Derogation — Police officers.#Case C-254/18.