In most places on WikiTree we've always used the long form Month DD, YYYY, e.g. August 15, 2016.
Where space is tight we use DD Mon YYYY, e.g. 15 Aug 2016.
I know the latter is actually preferred by many genealogists. Would you like to see DD Mon YYYY everywhere?
I'll post "yes" and "no" answers. Please use the +1 to vote your preference. If you'd prefer something other than these two options, post a new answer.