Where’s the editor:
Is it?:
“The Danish personal registration number, commonly referred to as the CPR number, reached the milestone of 50 years since its introduction on Monday. “
Or is it (my view)?:
On Monday, the Danish personal registration number, commonly referred to as the CPR number, reached the milestone of 50 years since its introduction.
I think my version avoids the possible misleading idea that the CPR number had its introduction on Monday.
Maybe they ran the Ritzau article through Google Translate.