We can all arrive at an overall time window for the collection of books. It is often useful to describe, however, a narrower scope of time than say the century in which this all takes place. After all, a lot of things will happen at the start of the century that would be out of place at the end of that century since the conditions will have changed, in fact "evolve rapidly". It would be unfortunate to lose any sense of where in the timeline of events these individual incidents take place.
I'd like to open a dialog regarding development and adoption of some sort of representation of years and months in the Expanse timeline, something similar to what I believe has happened in the Star Wars timeline. We may have a time scale for the books and a parallel one for the TV show but there needs to be numbers. For instance each book would get a range of numbers that fit into a larger sequence for the whole series. We can think of it as though we are historians within the same universe assigning dates after the fact.
If each book is roughly a year, we can start with that as a basis. We can use the Scopuli's encounter with the Anubis as year 1, month 1, day 1. The Protogen protomolecule experiment upon the Martians could be an alternate basis for the start of the era. Year two could be the first protomolecule-human hybrid release on Ganymede.
I might have preferred to base all of this timeline stuff on the date of Solomon Epstein's "successful" but fatal drive experiment if only we had more information to establish the chronology.
I've started the article Timeline and chronology
Let me know your thoughts on what adjustments and considerations need to be made.