Hi @KimB. That message is only a warning for developers, not an error, and should not impact your Auspice installation. It is unrelated to the file timestamps you see.
Separately, those timestamps of 1985 are an intentional choice (for reasons I won’t get into here) by NPM, the package manager used to distribute and install Auspice. All packages used by NPM use the same fixed date in 1985.
In any case, nothing is amiss and Auspice should work just fine.