If it is advisable convert Milliseconds to Date in Javascript, then you are able to do the next:
Learn how to Convert Milliseconds to Date in Javascript
let date = new Date(milliseconds);
date.toString();
Frequent Date Conversions From Milliseconds in Javascript
let originalDate = new Date(milliseconds);
// output: "D/MM/YYYY, H:MM:SS PM/AM"
originalDate.toLocaleString();
//output: "D/MM/YYYY"
originalDate.toLocaleDateString();
// output: "Day Month DD YYYY"
originalDate.toDateString();
// output: "HH:MM:SS GMT+0530"
originalDate.toTimeString();
// output: "Day Month DD YYYY HH:MM:SS GMT+0500"
originalDate.toString();
// output: "H:MM:SS AM/PM"
originalDate.toLocaleTimeString();
