how to convert Timestamp in milliseconds to javascript ? (in React)

Question

Consider code below,

const appointments = [

  {
    // id: 0,
  title: 'Watercolor Landscape',
  users_id: 2,
    startDate: new Date(1584576000000 * 1000),   // here is timestamps in milliseconds 
    endDate:  new Date(1584662400000* 1000),       // here is timestamps in milliseconds
    ownerId: 1,
  },
];

but the output of startDate was wrong, :

It should be:

startDate: Thursday, March 19, 2020 8:00:00 AM GMT+08:00

endDate: Friday, March 20, 2020 8:00:00 AM GMT+08:00

`1584576000000` is already in milliseconds. You're actually just making 1000 times more milliseconds than before. — VLAZ, Apr 01 '20 at 10:09
Remove *1000. Try using moments library, there are many formats available. [https://momentjs.com] — Anglesvar, Apr 01 '20 at 10:09
There is no need to multiply with 1000. It is already in milliseconds — thstamod, Apr 01 '20 at 10:09
@AnglesvarCheenu no need. This is a problem with how the code is written, not a problem with how it's interpreted by the Date object. — VLAZ, Apr 01 '20 at 10:10

score 2 · Accepted Answer · answered Apr 01 '20 at 10:11

2

Please simply use: new Date(your_timestamps)
So in your code: startDate: new Date(1584576000000)

Read more about Date object in Javascript here https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

answered Apr 01 '20 at 10:11

Paul Nguyen

36
3

score 1 · Answer 2 · answered Apr 01 '20 at 10:11

1

unix timestamp is already in milliseconds, Date.now() gets timestamp in milliseconds!

to get unix timestamp in seconds you need to divide it in 1000

Math.floor(Date.now() / 1000)

answered Apr 01 '20 at 10:11

amdev

6,703
6
42
64

Ludolfyn · Answer 3 · 2020-04-01T11:12:18.330

1

To get a timestamp in milliseconds in JS you can do:

var date = new Date();
var timestamp = date.getTime();

If you don't intend to support IE8 or previous versions you can use:

Date.now();

NOTE: A timestamp is the number of milliseconds that have passed since January 1, 1970.

how to convert Timestamp in milliseconds to javascript ? (in React)

4 Answers4