I set my PC clock to 30 years in the future and it broke Tarky

Well it's safe to assume that you corrupted your profile by doing this and I assume you have no profile backups?

Could you upload your profile here? Want to have a look and try something on it lol.

My initial thought of how to fix it did not work unfortunately. But, I managed to play around with some numbers and it appears the profile is working.

I changed some values, one of which was the error you got on start up and another error that appeared after buying something from a trader, and it allows me to go into raid, die, buy from traders and from the FleaMarket. Did a quest and I could claim the reward fine. Only issue I notice is that your Defective Wall timer is at 43 hours and I have no idea how to fix that.

This profile only has value changes from the errors, I've not loaded it on my SPT at all. None of the progress/losses that I did through testing. I've got no guarantees on it, as I'm not very experienced, and you can use it if you wish. I would recommend keeping your previous profile as a backup just in case.

I would hope this fixes everything but as I said, no guarantees.