I've been looking into adding this in a way where it's easy to see and accessible.
I have a working idea here would you be able to provide feedback on whether this would work for you or you would want to see any changes to the system for changing how dates are overriden?
https://github.com/RandomGamingDev/yt-times/issues/2

btw I'm going to avoid adding libraries for now to keep the extension easy to read through, verify yourself, and lightweight, but I can if the people requesting this feature think it'd be something worth adding.