This isn't a solution to the search problem but a good option would be to add the ability to search by original index date. Google and DDG have operators for se

This isn't a solution to the search problem but a good option would be to add the ability to search by original index date. Google and DDG have operators for searching by date, but they are limited and seem to be looking for dates declared in the indexed documents, not on an internal date. One advantage to searching by original index date is that it cannot be manipulated by SEO's retroactively, so searches can be crafted to get results from before a time when SEOs started manipulating the topic you are interested in.