[pjscott]

The HTTP headers can put an upper bound on the date:

    Last-Modified: Fri, 29 Oct 2010 16:59:15 GMT

And the changelog for CIL suggests that it may be significantly older:

http://www.eecs.berkeley.edu/~necula/cil/changes.html

[dang]

That header trick is a good one.

Ok, we'll put 2010 on it even though it is likely quite a bit older. An upper bound is better than nothing.