var dateString = "23/10/2015"; // Oct 23
var dateParts = dateString.split("/");
// month is 0-based, that's why we need dataParts[1] - 1
var dateObject = new Date(+dateParts[2], dateParts[1] - 1, +dateParts[0]);
console.log(dateObject); // Fri Oct 23 2015 00:00:00