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Using moment.js (with moment-timezone), I want to get the timezone abbreviation (e.g. PST) for the current locale.

var now = Date.now(); // 1423254073931
var zone = moment(now).zone(); // 480
var timezone =

How do I get the timezone abbreviation? All of the examples I have seen in the docs and elsewhere pick a specific region like "America/New_York".

From the docs, it looks like I can get the information out of the Zone Object with zone.abbr(timestamp) but I'm not sure how to access the zone object.

JSFiddle

Matt Johnson-Pint
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thetallweeks
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  • And you can't use `/\(([^)]+)\)/.exec(new Date())[1]` ? – Rob Raisch Feb 06 '15 at 21:45
  • @RobRaisch I don't think that will work cross browser. For instance, this is the result of `new Date` in Firefox: `2015-02-06T23:40:57.085Z` – thetallweeks Feb 06 '15 at 23:42
  • Actually, the result of `new Date()` is a new instance of a Date object which FF appears to print to the console in a non-standard format. So instead of the above, you can `/\(([^)]+)\)/.exec((new Date()).toString())[1]` which here in Boston, returns "Eastern Standard Time" – Rob Raisch Feb 06 '15 at 23:52
  • My mistake, I see that with `toString`, the date looks the same in Chrome and Firefox. But even with this fix, I still have inconsistencies across browsers (some say EST while others say Eastern Standard Time). This is why I was hoping to utilize moment.js, since it normalizes many things across various browsers. – thetallweeks Feb 07 '15 at 01:44
  • Yeah, it's a nice idea, but the output of the date object in string format is completely implementation specific. The ES5 spec does not guarantee any specific results, and in practice you'll find browsers vary the results between versions and OS. – Matt Johnson-Pint Feb 07 '15 at 01:59
  • http://kevalbhatt.github.io/WorldMapGenerator/ see this – Keval Bhatt Dec 15 '15 at 06:05

2 Answers2

36

The title and the question are different. In the title, you ask how to get it using the offset - which would not be possible. There are many time zones that share the same offset, so it isn't possible to distinguish a time zone abbreviation from an offset alone.

But in the question, you asked how to get the abbreviation for the current locale, for a specific timestamp.

The general problem is, there is no fully-reliable way to detect the current time zone. This is discussed in this answer. So moment-timezone can't deterministically tell which time zone should be loaded by default.

There are some other options available though.

Current browsers / node

In current browsers, the ECMAScript Internationalization API extensions are supported on the toLocaleString function of the Date object. When supported, you can do this:

    var d = new Date(); // or whatever date you have
    var tzName = d.toLocaleString('en', {timeZoneName:'short'}).split(' ').pop();

In current browsers, you'll get a value like "EST". You might want to do some sort of tests though, because it won't work in all browsers.

Use jsTimeZoneDetect

You could use a script like jsTimeZoneDetect to guess at the local time zone. It's usually correct, but not guaranteed. You could then pass that value to moment-timezone.

    var tzName = jstz.determine().name();
    var m = moment();
    var abbr = m.tz(tzName).zoneAbbr();  // or .format('z')

Use moment-timezone

There is also now built-in support for time zone detection/guessing in moment-timezone:

    var tzName = moment.tz.guess();
    var abbr = m.tz(tzName).zoneAbbr();  // or .format('z')
mikemaccana
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Matt Johnson-Pint
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5

Latest build of moment.js would give you timezone guess: PR#220 for example: moment.tz.guess(); will result in 'America/New_York'

DPP
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