The table_sorter.js expects a class of 'sortabledata-*' otherwise it tries to sort the column alphabetically - not so useful with dates, especially when they may be in the US month-first format.
As the tabular_view.pt template in plone.app.collections already has a special case for Dates I'm suggesting it also add a class along the lines of 'sortabledata-20160726'.
I am aware this only works on the page of results shown, the use-case we're coming across doesn't paginate the results anyway.
Would this be the best way to go about this? Should the time be included as well or is that potentially going to complicate things?