What is the date of the earliest known primate?

The earliest known primates are believed to have appeared around 65 million years ago, during the late Cretaceous or early Paleocene epoch. Fossil evidence suggests that these early primates were small, tree-dwelling mammals. Notable genera include Purgatorius, which is often considered one of the first primates or primate-like mammals. This timing aligns with the extinction of the dinosaurs, allowing for the diversification of mammalian species, including primates.