JSFiddle - React, Tailwind, and code Playground

JavaScript

var date = new Date(1439198499*1000);

// Days part from the timestamp
var days = date.getDay();

// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = "0" + date.getMinutes();


// Will display time in 10:30:23 format
var formattedTime = days + ':' + hours + ':' + minutes.substr(-2);
console.log(formattedTime);