Type Datetime incorrect format /Date(1566916268000)/ how to solve?

Question

The return of the Dt_start field returned from the Database is correct: 26/08/2019 11:08:10

But not in javascript is like this: /Date(1566916268000)/, see:

$.each(response.listar, function (index, item) {
    console.log("item.Dt_Inicio: " + item.Dt_Inicio); <-- /Date(1566916268000)/
});

I tried to make this conversion but it doesn’t work:

var _dt = new Date(item.Dt_Inicio.toLocaleString()); 
var dd = _dt.getDate();
var mm = _dt.getMonth() + 1;
var yyyy = _dt.getFullYear();

console.log("item.Dt_Inicio: " + dd + "/" + mm + "/" + yyyy);

NaN/NaN/NaN