Joshua,
I understand the difference between relevance and most recent.
Google has an advanced search feature that allows you to filter by date. Google offers a custom search feature that can be added to BiggerPockets - http://www.google.com/cse
When I do a basic search for the keyword "Atlanta", I get back 67 pages with posts going back 4+ years. I clicked through the first couple of pages and the posts were all 3-4 years old, which I wouldn't consider relevant.
I'm typically not interested in anything older than a couple of months. This is where a sort by date feature would be nice.
I went to the advanced search and searched again for the keyword "Atlanta". I clicked search option "Time Frame" and selected 12 months. The search returned 0 results. So I think there may be a bug here.
I was able to do and advanced search for the keyword "Atlanta" and sort the results by post time, descending. This was the only way I could view recent posts with the keyword "Atlanta"
Thanks,
wade