RunKit + npm: date-fns

const faIR = require('date-fns/locale/faIR'); const fr = require('date-fns/locale/fr'); const format = require('date-fns/format'); const patern = 'PPpp'; console.log(format(new Date(2016, 0, 1), patern, {locale: null})); console.log(format(new Date(2016, 0, 1), patern, {locale: faIR}));