how to print in console how many days current month has javascript without using function code example

Example 1: minus month javascript date

var d = new Date("January 14, 2012");
console.log(d.toLocaleDateString());
d.setMonth(d.getMonth() - 3);
console.log(d.toLocaleDateString());

Example 2: javascript date 3 months ago

var d = new Date();
d.setMonth(d.getMonth() - 3);

Example 3: moment js get french time 20:00:00

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

Example 4: moment format heure

var time = "15:30:00";
var formatted = moment(time, "HH:mm:ss").format("LT");
console.log(formatted); 
//it will return 3:30 PM

Example 5: moment get day

var check = moment(n.entry.date_entered, 'YYYY/MM/DD');

var month = check.format('M');
var day   = check.format('D');
var year  = check.format('YYYY');

Example 6: javascript date 3 months ago

var someDate = new Date(); // add arguments as needed
someDate.setTime(someDate.getTime() - 3*28*24*60*60);
// assumes the definition of "one month" to be "four weeks".