moment().format();                                // "2014-09-08T08:02:17-05:00" (ISO 8601, no fractional seconds)
moment(2021-06-03 02:30:00.690Z).format("dddd, MMMM Do YYYY, h:mm:ss a"); // "Sunday, February 14th 2010, 3:25:50 pm"
moment().format("ddd, hA");                       // "Sun, 3PM"
moment().format("[Today is] dddd");               // "Today is Sunday"
moment('gibberish').format('YYYY MM DD');         // "Invalid date"