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