I've been trying to figure out how to do this for months. By date, especially.
Click on the header to sort it by date/posts/creation date etc..
However the date seems to be broken but you can force by this link for example
It won't let me click the header for results from the search bar. I figured out how to sort the forums themselves.
If I type something into the search bar, I can't figure out how to sort those results.
EDIT: Oh, wow. I just realized it's completely different if you type it in the "search forums" box. I've been using the generic box.