js date substract month 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 get month name
var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
var d = new Date();
var monthName=months[d.getMonth()]; // "July" (or current month)