This is certainly a "if/when you have time for it" feature request, but it is one of the few things I still go to Google for and I try to do that as infrequently as possible. I figured I would let you know and you can implement it or ignore it, but at least then I will have let you know about it.
Google has the ability to filter search results by date and it would be great if DuckDuckGo could do the same. Often I am looking for something and just want current or current-ish results (e.g. if searching for a bug in OS X, I don't care about results from 2004 because it's likely been fixed since then). Sometimes, when searching for timely data such as this on DuckDuckGo, the result I am looking for is lost in older (irrelevant) results so I use your !g bang to pop over to Google where I can easily tell it to filter results to show only those from the past year or past month or past week.