I solved my problem:
In Worklist.view.xml I use formatter function:
Text text="{path:'Exdat', formatter: '.formatter.formatDate'}"
Then in formatter.js I write
formatDate: function (sValue) {
var date = new Date(parseInt(sValue.substr(6)));
var oFormat = sap.ui.core.format.DateFormat.getDateInstance({pattern: "dd.MM.YYYY"});
return oFormat.format(date);
},