The old, old forum software of about 5+ years ago would allow that. You could select one or more forums, Set date parameters and member. For example you could search for posts by “member XY” in forum(s) “Lounge” and “Deli” between the dates of “January 1, 2009 to January 31st 2019”. I don’t remember what the forum software was at that time. Sadly this capability was lost about 3 software updates ago.