lib : https://unpkg.com/jalali-moment@3.3.8/dist/jalali-moment.browser.js usage : moment(new Date()).format('jYYYY/jM/jD'); moment(new Date()).locale('fa').subtract(1,'month').format('YYYY/MM/DD'); moment(new Date()).locale('fa').add(1,'day').format('YYYY/MM/DD');