User blog:TheAtomicLight/Dates in refs

I'm confused as to which date(s) I'm supposed to use in the references because neither of the dates for this currently used ref, "Weisman, Greg (2011-05-25). "Question #13373". Ask Greg. Retrieved 2011-05-27.", actually have the one featured on the site itself. -- Anythingspossibleforapossible 10:58, October 21, 2011 (UTC)