Javascript - Get Previous Months Date

Question

If i have a variable that returns a date, in the format of dd MMM yyyy, so 28 Aug 2014, how can i get the date of the previous month.

I can modify the month via:

Answer 1

There is my way to get previous months.

const formatter = new Intl.DateTimeFormat("default", {
  month: "long"
});
const date = new Date();

let number = 1;
let prevMonth = formatter.format(
  new Date(date.getFullYear(), date.getMonth() - `${number}`)
);