I saw the answer to this question, but no where mentioned about sorting by date which I am asking in this question.
How to sort unanswered questions by date?
If you are referring to date asked, you can search
answers:0 (add [tagname] to the search if you wish to search by tag) and then select the "newest" tab. Here is a link to an example of that search method pre-done. If you want to search by date of lastest activity instead of date asked, do the steps above and use the "active" tab instead of the "newest" tab.