I have a point layer with features of which some share the same date (fieldname: 'Datum' with format: "dd.MM.yyyy"). The date that is shared by some features is not a single specific one but can be any possible date.
I want to select all features that share the same date AND are close together (for example less than 500 meters away from each other).
I then want to keep only one of those features and erase the other one. Which one to delete can be random.
How can I do that?