momentjs.com clone code example
Example 1: moment date add
var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');
Example 2: moment js npm
moment.locale(); // en
moment().format('LT'); // 8:41 PM
moment().format('LTS'); // 8:41:43 PM
moment().format('L'); // 04/11/2020
moment().format('l'); // 4/11/2020
moment().format('LL'); // April 11, 2020
moment().format('ll'); // Apr 11, 2020
moment().format('LLL'); // April 11, 2020 8:41 PM
moment().format('lll'); // Apr 11, 2020 8:41 PM
moment().format('LLLL'); // Saturday, April 11, 2020 8:41 PM
moment().format('llll'); // Sat, Apr 11, 2020 8:41 PM
// undefined