I guess this depends upon whether you consider the OP's 'problem' to be that he didn't know how to find the date of a file, or that the module he found that would do what he needed to do, but couldn't install it for reasons that he wasn't able to correct.

My own take was that as he hadn't yet discovered the filetest operators, this was a wheel that he probably shouldn't try to re-invent (yet).

Sometimes, an open question gets a better answer than a targeted one specifically because it gathers answers from a variety of perspectives?