Sorting by date with Data Tables sorting extension

Hi – another question I’m afraid…
I want my table to be sortable, with the initial view sorted by date, newest first.

I’m installed the Data Tables sorting plugins from the tablepress.org homepage, and all the data in the table is formatted dd/mm/yyyy. After searching around on the tablepress and wp-table reloaded forums, I found 2 custom commands which seem relevant:

when i used:
"aaSorting": [[3,'desc']]
that gave me the initial view sorted fine, biggest to smallest but it wasn’t recognising the column as containing dates (so eg 23/06/2003 would be shown above 01/06/2012). I couldn’t work out whether datatables was supposed to detect the data format automatically or not. Then I added another command:
"aoColumnDefs": [ { "sType": "html", "aTargets": [ "column-3" ] } ]
which gave me the column sorted by date. The only problem was that it was sorted oldest first, rather than newest first, and also it was not possible for the visitor to sort by other columns (I assume this comes from a Javascript error, probably putting two commands in without knowing the correct syntax).

So what should I put in the custom commands box to get a sortable table, initially sorted by date, newest first?

Thanks ever so much Tobias or anyone else who feels like helping!

https://www.ads-software.com/extend/plugins/tablepress/