How does one date a flint dagger?

In the Dagger Period, at the end of the Neolithic era, the magnificent flint daggers were popular. Although the flintworkers were conservative and bound by tradition, they were also open to new currents of fashion. The appearance of the flint daggers therefore changed over time. Using these changes in the design archaeologists can divide them into six dagger types that can be dated relatively narrowly. It is mainly the hilts that distinguish the types. - The Hindsgavl Dagger is a type IV dagger.