[javascript] How can I get the timezone name in JavaScript?

I know how to get the timezone offset, but what I need is the ability to detect something like "America/New York." Is that even possible from JavaScript or is that something I am going to have to guestimate based on the offset?

Most upvoted answer is probably the best way to get the timezone, however, Intl.DateTimeFormat().resolvedOptions().timeZone returns IANA timezone name by definition, which is in English.

If you want the timezone's name in current user's language, you can parse it from Date's string representation like so:

function getTimezoneName() {_x000D_
  const today = new Date();_x000D_
  const short = today.toLocaleDateString(undefined);_x000D_
  const full = today.toLocaleDateString(undefined, { timeZoneName: 'long' });_x000D_
_x000D_
  // Trying to remove date from the string in a locale-agnostic way_x000D_
  const shortIndex = full.indexOf(short);_x000D_
  if (shortIndex >= 0) {_x000D_
    const trimmed = full.substring(0, shortIndex) + full.substring(shortIndex + short.length);_x000D_
    _x000D_
    // by this time `trimmed` should be the timezone's name with some punctuation -_x000D_
    // trim it from both sides_x000D_
    return trimmed.replace(/^[\s,.\-:;]+|[\s,.\-:;]+$/g, '');_x000D_
_x000D_
  } else {_x000D_
    // in some magic case when short representation of date is not present in the long one, just return the long one as a fallback, since it should contain the timezone's name_x000D_
    return full;_x000D_
  }_x000D_
}_x000D_
_x000D_
console.log(getTimezoneName());

Tested in Chrome and Firefox.

Ofcourse, this will not work as intended in some of the environments. For example, node.js returns a GMT offset (e.g. GMT+07:00) instead of a name. But I think it's still readable as a fallback.

P.S. Won't work in IE11, just as the Intl... solution.

You can use this script. http://pellepim.bitbucket.org/jstz/

Fork or clone repository here. https://bitbucket.org/pellepim/jstimezonedetect

Once you include the script, you can get the list of timezones in - jstz.olson.timezones variable.

And following code is used to determine client browser's timezone.

var tz = jstz.determine();
tz.name();

Enjoy jstz!

In javascript , the Date.getTimezoneOffset() method returns the time-zone offset from UTC, in minutes, for the current locale.

var x = new Date();
var currentTimeZoneOffsetInHours = x.getTimezoneOffset() / 60;

Moment'timezone will be a useful tool. http://momentjs.com/timezone/

Convert Dates Between Timezones

var newYork    = moment.tz("2014-06-01 12:00", "America/New_York");
var losAngeles = newYork.clone().tz("America/Los_Angeles");
var london     = newYork.clone().tz("Europe/London");

newYork.format();    // 2014-06-01T12:00:00-04:00
losAngeles.format(); // 2014-06-01T09:00:00-07:00
london.format();     // 2014-06-01T17:00:00+01:00

You can simply write your own code by using the mapping table here: http://www.timeanddate.com/time/zones/

or, use moment-timezone library: http://momentjs.com/timezone/docs/

See zone.name; // America/Los_Angeles

or, this library: https://github.com/Canop/tzdetect.js

This gets the timezone code (e.g., GMT) in older javascript (I'm using google app script with old engine):

function getTimezoneName() {
  return new Date().toString().get(/\((.+)\)/);
}

I'm just putting this here in case someone needs it.

Retrieve timezone by name (i.e. "America/New York")

moment.tz.guess();

The Internationalization API supports getting the user timezone, and is supported in all current browsers.

console.log(Intl.DateTimeFormat().resolvedOptions().timeZone)

Keep in mind that on some older browser versions that support the Internationalization API, the timeZone property is set to undefined rather than the user’s timezone string. As best as I can tell, at the time of writing (July 2017) all current browsers except for IE11 will return the user timezone as a string.

Try this code refer from here

<script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js">
</script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jstimezonedetect/1.0.4/jstz.min.js">
</script>
<script type="text/javascript">
  $(document).ready(function(){
    var tz = jstz.determine(); // Determines the time zone of the browser client
    var timezone = tz.name(); //'Asia/Kolhata' for Indian Time.

    alert(timezone);
});
</script>