I've been playing for *checks account* 1002 days, 23 hours. So, by 2021, it will have been three years. I think it takes place in its own continuity, largely inspired by G1 but borrowing from other places.
Also, make the setting an amalgamation of different Transformers series, rather than based on a specific one. Bring in things like 'Sentinel Major' as the primo Autobot jerk, and sleek car mode Vehicons as the Decepticons' basic grunt.