https://www.uu.nl/en/organisation/about-us/tradition-and-history/academic-traditions/dies-natalis
The Dies Natalis, Utrecht University's Anniversary Day, is celebrated on 26 March: the day in 1636 when the Illustrious School became an academic university.
dies natalisutrecht universityorganisation
https://www.universiteitleiden.nl/dossiers/dies-natalis/dies-natalis-2022
De Universiteit Leiden vierde op 8 februari 2022 haar 447ste stichtingsdag.
dies natalisuniversiteit leiden