I am sure this used to be possible. However now, when I select "unanswered" the query is obviously answered by sorting via votes received and I don't know how to sort unanswered questions by date, most recent questions first.
1 Answer
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If you follow the "Unanswered" link on the sidebar on the left of the page, then the page you get has options for sorting the unanswered questions. A direct link is: https://mathoverflow.net/unanswered/tagged/?tab=newest