JAVASCRIPT

js read date from milliseconds

const miliseconds = 1604395966369;

const date = new Date(miliseconds);

convert date to millisecond in javascript

var date = new Date("11/21/1987 16:00:00"); // some mock date
var milliseconds = date.getTime(); 
// This will return you the number of milliseconds
// elapsed from January 1, 1970 
// if your date is less than that date, the value will be negative

console.log(milliseconds);

milliseconds to date javascript

	//Date.now() gives us the current time in milliseconds counted from 1970-01-01
const todaysDate = Date.now();
    //Let's add 1 year of milliseconds. 
    // We know that there is 1000 milliseconds in 1 second. 
    // 60 seconds in 1 minute, 
    // 60 minutes in 1 hour, 
    // 24 hours in 1 day 
    // and 365 days in one year (leap year not included)
const dateInOneYear = new Date(todaysDate+(1000*60*60*24*365)); 
    //To print them out in a readable way
console.log(new Date(todaysDate).toLocaleDateString())
console.log(new Date(dateInOneYear).toLocaleDateString())

javascript new Date(milliseconds)

const time1 = new Date(0);

// epoch time
console.log(time1); // Thu Jan 01 1970 05:30:00

// 100000000000 milliseconds after the epoch time
const time2 = new Date(100000000000)
console.log(time2); // Sat Mar 03 1973 15:16:40

get date in milliseconds javascript

var myDate = +new Date("2012-02-10T13:19:11+0000");

milliseconds to date javascript

var d = new Date(1469433907836); // Parameter should be long value

d.toLocaleString()     // 7/25/2016, 1:35:07 PM
d.toLocaleDateString() // 7/25/2016
d.toDateString()       // Mon Jul 25 2016
d.toTimeString()       // 13:35:07 GMT+0530 (India Standard Time)
d.toLocaleTimeString() // 1:35:07 PM
d.toISOString();       // 2016-07-25T08:05:07.836Z
d.toJSON();            // 2016-07-25T08:05:07.836Z
d.toString();          // Mon Jul 25 2016 13:35:07 GMT+0530 (India Standard Time)
d.toUTCString();       // Mon, 25 Jul 2016 08:05:07 GMT