what is the standard locale for Great Britain

Specifically I'm trying to set up a countries model in my rails application that will contain the locale settings used by Rails i18n.

I have found conflicting information about how Great Britain is represented.

According to this source it is en-GB https://github.com/svenfuchs/rails-i18n/tree/master/rails/locale

But according to this source it is en-U开发者_如何学CK http://guides.rubyonrails.org/v2.3.8/i18n.html

is it GB or UK, or does it matter?

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It should be GB because the 2-letter country codes should correspond to those in ISO 3166 http://www.davros.org/misc/iso3166.html

I believe it is not uncommon to treat UK as an alias for GB, and as such support both.

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It depends on Rails version. In 2.x it was en-UK, and then for Rails 3 it was changed to en-GB.