sorting columns by date not working

Sorting columns by date does not work. I have a test site running 2.0 RC1 but getting the sort by date working is not possible. I have installed the required plugin and it is activated (TablePress Extension: DataTables Sorting plugins).

I have put the following command in table setting:
“columnDefs”: [ { “type”: “date-eu”, “targets”: [ 3 ] } ]

No success. Any idea?

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