How to set language globally for moment.js

See official docs on how changing locale globally.

Note that you have to import locale data (e.g. moment-with-locales.min.js)

Here a working example:

moment.locale('de');
console.log(moment(Date.now()).fromNow()); //vor ein paar Sekunden

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment-with-locales.min.js"></script>

You can also use only data for a given locale (e.g. de):

moment.locale('de');
console.log(moment(Date.now()).fromNow()); //vor ein paar Sekunden

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/locale/de.js"></script>

Moreover you are redefining moment in your code, that is incorrect

var moment = moment();

EDIT: In the current version of moment.js this solution still works but it will output a message to the console that states you should use a new method called updateLocale. So the new solution should look like:

Updated solution

import moment from 'moment';
import localization from 'moment/locale/fr';

moment.updateLocale('fr', localization);

Previous Solution

You can change moment locale globally like that:

import moment from 'moment';
import localization from 'moment/locale/fr';

moment.locale('fr', localization);

I hope this helps you.

To build onto the answer by Gapur, how I got it to work (React native) was like this,

... other imports
import moment from "moment";
import russianLocale from "moment/locale/ru";
import englishLocale from "moment/locale/en-gb";
import chineseLocale from "moment/locale/zh-cn";

const Component = ({ ...props, language }) => {
  moment.locale(language);

... logic

// wherever 'moment' is used, it's displayed in 
// the language that is indicated by the language prop

... other logic

moment version 2.24.0