The pro-tem moderator appointment date is currently shown in middle-endian notation (%m/%d/%y). For example, see Outdoors.SE moderators:
6/5/2014 ambiguous and hard to parse. From the other appointments, I can infer that it must be the middle-endian
%m/%d/%y, so that this really means 2014-06-05, which is arguably the only correct date notation. Another alternative would be to only mark the year, such as for elected moderators on graduated sites.