It does, but what you are really seeing under the column "Date posted" is the date when the thread was created, not the date when the listed item (concrete post under column "Subject") was actually created (/edited?). If you click on the inner most link within the "Subject" column, you’ll see that the list is actually ordered by post date, although the list is actually displaying the thread’s date (which is misleading).

Additionally, since only 5 pages are displayed, and these seem to show from the end of the date frame range regardless if the sort order, it’s important to delimit the message age to see entries around the dates you wish to observer (if applicable).

i.e. If you search for the term "forum" + order by most recent topic first, you’re still going to see a bunch of entries from 2011. Nevertheless, if you delimit the message age to 0..30 days, you’ll see the most recent entries.