which date format moment by default have code example

Example 1: moment format date

moment().format();                                // "2019-08-12T17:52:17-05:00" (ISO 8601, no fractional seconds)
moment().format("dddd, MMMM Do YYYY, h:mm:ss a"); // "Monday, August 12th 2019, 5:52:00 pm"
moment().format("ddd, hA");                       // "Mon, 5PM"

Example 2: moment date add

var new_date = moment(startdate, "DD-MM-YYYY").add(5, 'days');