moment locale not set correctly

We're trying to find a problem with tests that use moment.js and fail when run on a server in Arizona but succeed when run locally here in the UK. We manually set the locale before creating a moment and can see that the local 'en-gb' is installed.

This fiddle highlights what I think the problem is (Need to set computer to Arizona Time zone first!)

moment.locale('en-gb'); console.log(moment.locale()); // en-gb console.log(moment('2016-05-01T00:00:00+00:00').format()); // 2016-04-30T17:00:00-07:00 

I'm expecting to see the date formatted with respect to 'en-gb' locale but it shows it with respect to Arizona time. Am I missing something?

3 Answers

Locale and timezone are orthogonal things. A locale does not specify a timezone unambigously. You need to set your timezone separately. You can use Momemt Timezone, and then you can use e.g.

.tz('Europe/London') 

By setting moment.locale('en-gb') you have specified a locale/language (brittish-english), not a timezone.

To specify a timezone you need to include the Moment.js Timezone library in your project, and then do something like:

console.log(moment('2016-05-01T00:00:00+00:00').tz('America/Phoenix').format()); 

The above will give you the timezone for Arizona.

After reading more I believe parseZone is the correct solution, given that I am already including Time Zone information in the date string.

console.log(moment.parseZone('2016-05-01T00:00:00+00:00').format());