Seting up a computer as a archive- If I change the time foward21 then to now will flash still work?

I want to test whether my flash games will still work in 2021 on my local isolated machine (it uses an older version of flash) by changing the time forward and my question is if the killswitch happens while my time is in 2021 will it revert to allow flash if I change it back to somewhere in 2020? I only have a couple hours left to test this so a quick answer would be much appreciated 🙂