momentjs isvalid false code example
Example 1: moment js date diff
var now = "04/09/2013 15:00:00";
var then = "02/09/2013 14:20:30";
var ms = moment(now,"DD/MM/YYYY HH:mm:ss").diff(moment(then,"DD/MM/YYYY HH:mm:ss"));
var d = moment.duration(ms);
var s = d.format("hh:mm:ss");
// outputs: "48:39:30"
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