;(function(){

    if(window.moment === void 0)

        return console.error("Moment.js must be loaded first");

​

    var cdnLink = 'https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/locale/';

    var loaded = new Set();

​

    var available = ['af','ar-dz','ar-kw','ar-ly','ar-ma','ar-sa','ar-tn','ar','az','be','bg','bm','bn','bo','br','bs','ca','cs','cv','cy','da','de-at','de-ch','de','dv','el','en-au','en-ca','en-gb','en-ie','en-il','en-nz','en-SG','eo','es-do','es-us','es','et','eu','fa','fi','fo','fr-ca','fr-ch','fr','fy','ga','gd','gl','gom-latn','gu','he','hi','hr','hu','hy-am','id','is','it-ch','it','ja','jv','ka','kk','km','kn','ko','ku','ky','lb','lo','lt','lv','me','mi','mk','ml','mn','mr','ms-my','ms','mt','my','nb','ne','nl-be','nl','nn','pa-in','pl','pt-br','pt','ro','ru','sd','se','si','sk','sl','sq','sr-cyrl','sr','ss','sv','sw','ta','te','tet','tg','th','tl-ph','tlh','tr','tzl','tzm-latn','tzm','ug-cn','uk','ur','uz-latn','uz','vi','x-pseudo','yo','zh-cn','zh-hk','zh-tw'];

    moment.loadLocale = function(locale, callback){

        if(locale.length > 10)

            return; // Unexpected input

​

        if(locale.indexOf('_') !== -1)

            locale = locale.split('_');

        else

            locale = locale.split('-');

​

        var found = false;

        for(var i=0, n=locale.length; i<n; i++){

            var temp = locale.join('-');

            if(available.indexOf(temp) !== -1){

                found = temp;

                break;

            }

​

            locale.pop();

        }

​

        if(found !== false){

            if(loaded.has(found)){

                moment.locale(found);

                return callback && callback(found);

            }

​

            var xhr = new XMLHttpRequest();

            xhr.open("GET", cdnLink+found+'.js');

​

            xhr.onreadystatechange = function(){

                if(xhr.status === 200 && xhr.readyState === 4){

                    this.moment = window.moment;

                    loaded.add(found);

                    eval(xhr.responseText); // Because HTML5 doesn't execute dynamic script tag

​

                    moment.locale(found);

                    callback && callback(found);

                }

            };

​

            xhr.send();

            return;

        }

​

        callback && callback(false);

    }

})();

​

// Example

moment.loadLocale('ja_JP', function(found){

    if(found === false)

        return console.error("Language not found");

    console.log(moment().format('LLLL'));

});