Is there a way to change the dates on the comments to the date they were recorded? It would be fun to see these as "comment made 240 years ago"

I was hoping so! I figured maybe that would break the date system, too.

Anyone know how?

Yes, like this. https://github.com/gelstudios/gitfiti

Setting the GIT_AUTHOR_DATE and GIT_COMMITTER_DATE environment variables.