This method will get/set the day of the month. It takes input from 1-31, if greater than the range provided it will add to the next month.
moment().date(Number); moment().date(); moment().dates(Number); moment().dates();
var m = moment().date(); // gets the current day of the month var d = moment().date(2); // sets the day of month as shown below var k = moment().date(40); //sets the day of month which is greater than the range so the output shows the next month as shown in the output