Edit

Editing: sr.js

//! moment.js locale configuration

;(function (global, factory) {
   typeof exports === 'object' && typeof module !== 'undefined'
       && typeof require === 'function' ? factory(require('../moment')) :
   typeof define === 'function' && define.amd ? define(['../moment'], factory) :
   factory(global.moment)
}(this, (function (moment) { 'use strict';

var translator = {
        words: { //Different grammatical cases
            ss: ['sekunda', 'sekunde', 'sekundi'],
            m: ['jedan minut', 'jedne minute'],
            mm: ['minut', 'minute', 'minuta'],
            h: ['jedan sat', 'jednog sata'],
            hh: ['sat', 'sata', 'sati'],
            dd: ['dan', 'dana', 'dana'],
            MM: ['mesec', 'meseca', 'meseci'],
            yy: ['godina', 'godine', 'godina']
        },
        correctGrammaticalCase: function (number, wordKey) {
            return number === 1 ? wordKey[0] : (number >= 2 && number <= 4 ? wordKey[1] : wordKey[2]);
        },
        translate: function (number, withoutSuffix, key) {
            var wordKey = translator.words[key];
            if (key.length === 1) {
                return withoutSuffix ? wordKey[0] : wordKey[1];
            } else {
                return number + ' ' + translator.correctGrammaticalCase(number, wordKey);
            }
        }
    };

var sr = moment.defineLocale('sr', {
        months: 'januar_februar_mart_april_maj_jun_jul_avgust_septembar_oktobar_novembar_decembar'.split('_'),
        monthsShort: 'jan._feb._mar._apr._maj_jun_jul_avg._sep._okt._nov._dec.'.split('_'),
        monthsParseExact: true,
        weekdays: 'nedelja_ponedeljak_utorak_sreda_četvrtak_petak_subota'.split('_'),
        weekdaysShort: 'ned._pon._uto._sre._čet._pet._sub.'.split('_'),
        weekdaysMin: 'ne_po_ut_sr_če_pe_su'.split('_'),
        weekdaysParseExact : true,
        longDateFormat: {
            LT: 'H:mm',
            LTS : 'H:mm:ss',
            L: 'DD.MM.YYYY',
            LL: 'D. MMMM YYYY',
            LLL: 'D. MMMM YYYY H:mm',
            LLLL: 'dddd, D. MMMM YYYY H:mm'
        },
        calendar: {
            sameDay: '[danas u] LT',
            nextDay: '[sutra u] LT',
            nextWeek: function () {
                switch (this.day()) {
                    case 0:
                        return '[u] [nedelju] [u] LT';
                    case 3:
                        return '[u] [sredu] [u] LT';
                    case 6:
                        return '[u] [subotu] [u] LT';
                    case 1:
                    case 2:
                    case 4:
                    case 5:
                        return '[u] dddd [u] LT';
                }
            },
            lastDay  : '[juče u] LT',
            lastWeek : function () {
                var lastWeekDays = [
                    '[prošle] [nedelje] [u] LT',
                    '[prošlog] [ponedeljka] [u] LT',
                    '[prošlog] [utorka] [u] LT',
                    '[prošle] [srede] [u] LT',
                    '[prošlog] [četvrtka] [u] LT',
                    '[prošlog] [petka] [u] LT',
                    '[prošle] [subote] [u] LT'
                ];
                return lastWeekDays[this.day()];
            },
            sameElse : 'L'
        },
        relativeTime : {
            future : 'za %s',
            past   : 'pre %s',
            s      : 'nekoliko sekundi',
            ss     : translator.translate,
            m      : translator.translate,
            mm     : translator.translate,
            h      : translator.translate,
            hh     : translator.translate,
            d      : 'dan',
            dd     : translator.translate,
            M      : 'mesec',
            MM     : translator.translate,
            y      : 'godinu',
            yy     : translator.translate
        },
        dayOfMonthOrdinalParse: /\d{1,2}\./,
        ordinal : '%d.',
        week : {
            dow : 1, // Monday is the first day of the week.
            doy : 7  // The week that contains Jan 7th is the first week of the year.
        }
    });

return sr;

})));