How do you get a timestamp in JavaScript?

How can I get a timestamp in JavaScript?

Something similar to Unix's timestamp, that is, a single number that represents the current time and date. Either as a number or a string.

Text Copied From stackoverflow.com
on : Tue, Oct 21, 2008 Views : 2085787

Accepted Answer

var timeStampInMs = window.performance &
&
 window.performance.now &
&
 window.performance.timing &
&
 window.performance.timing.navigationStart ? window.performance.now() + window.performance.timing.navigationStart : Date.now();
  console.log(timeStampInMs, Date.now());

Short & Snazzy:

+ new Date() 

A unary operator like plus triggers the valueOf method in the Date object and it returns the timestamp (without any alteration).

Details:

On almost all current browsers you can use Date.now() to get the UTC timestamp in milliseconds; a notable exception to this is IE8 and earlier (see compatibility table).

You can easily make a shim for this, though:

if (!Date.now) 
{

  Date.now = 
function() 
{
 return new Date().getTime();
 

To get the timestamp in seconds, you can use:

Math.floor(Date.now() / 1000) 

Or alternatively you could use:

Date.now() / 1000 | 0 

Which should be slightly faster, but also less readable (also see this answer).

I would recommend using Date.now() (with compatibility shim). It's slightly better because it's shorter & doesn't create a new Date object. However, if you don't want a shim & maximum compatibility, you could use the old method to get the timestamp in milliseconds:

new Date().getTime() 

Which you can then convert to seconds like this:

Math.round(new Date().getTime()/1000) 

And you can also use the valueOf method which we showed above:

new Date().valueOf() 
Text Copied From stackoverflow.com
on : Tue, Oct 21, 2008

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