Users are confused by the 2000-01-01 00:00 UTC timestamp
Picture yourself: your browser tells you that there is an update. You go get the new shiny thing. And then, when you look at the date on it, it says more than 14 years ago. Confusing, neh?
I guess using the date of the latest Git commit would just work great.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information