Are you using the full site view or the mobile view? I ask because I just picked a forum at random (Commuting) and hit the advanced search. I was presented with "Search In" options, "Search For" options, and then "Additional Options".
Under "Additional Options", I was presented:
-Find Posts with a drop down menu for the date. Options range from last visit, yesterday, weeks, months, a year, or any date. Then I was given the option of either Newe or Older in a drop down menu.
-Sort Results by with a drop down menu. Options here are title, date, user name, or relevance. Then another drop down to arrange in Ascending Order or Descending Order.