See
http://community.wolfram.com/groups/-/m/t/283491
though, what's odd about this is that
In[14]:= EntityValue[Entity["Financial", "^DJI"] , EntityProperty["Financial", "LatestTrade"]]
Out[14]= {{2014, 12, 15, 22, 0, 0.}, 17180.8}
Is FinancialData using a different data source/API from the EntityValue call?
