Assign locale for moment.js

To assign locale in moment.js, we can use the following:

     moment.locale("en")

It will returns "en". However, if you assign an unaccepted locale to it, it won't update its value. For example:

     moment.locale("zh")

It still returns "en", since "zh" is not an accepted locale for moment.js.

Up till now, moment.js accepts:

     zh-hk
     zh-tw
     zh-cn

Reference: momentjs