I want to say that something happened between 1807-1809 or that it happened from 1807 till 1809. I figured out the phrases to use would be the below, but I'm not sure how to read the numbers. Do I ready them as tuhatkahdeksansataaseitsemän ja tuhatkahdeksansataayhdeksän (so nominatiivi) or should I use their genetiivi forms in the first one and the elatiivi and illatiivi in the second one?
Vuosien 1807 ja 1809 välillä
Vuodesta 1807 vuoteen 1809