JSFiddle - React, Tailwind, and code Playground

JavaScript

var dob = 1525219200;
var now = Date.now();

var age = new Date();
age = (dob - now).toUTCString()

document.write("dob: " + dob + "<br/>");
document.write("now: " + now + "<br/>");
document.write("age: " + age + "<br/>");