I have created a method that returns the past months according to the current date and how many months from the past you need, seems like the javascript date object is behaving wrongly.

I guess the problem has only popped up today as it's the 29th of the current month and subtracting 1 month from 29 March which is supposed to be 29 February (doesn't exist) lead javascript to fallback to +1 day...

Can someone please suggest a great fix for this. Thanks 🙌

export type Config = {
  n: number;
  i18n: i18n;
};

export default function NMonthsAgo(config: Config): MonthsAgo[] {
  const date = new Date();
  const { i18n } = config;
  let { n } = config;
  n = Math.max(n, 0);
  // add one month in future to include the current one.
  date.setMonth(date.getMonth() + 1);
  return Array.from({ length: n || 1 })
    .map(() => {
      date.setMonth(date.getMonth() - 1);
      console.log(date.toDateString()); ===> console print.
      return {
        monthName: formatDate(i18n, date, { month: 'long' }),
        monthNameShort: formatDate(i18n, date, { month: 'short' }),
        year: formatDate(i18n, date, { year: 'numeric' }),
      };
    })
    .reverse();
}

Output:

NMonthsAgo.js:36 Wed Dec 29 2021
NMonthsAgo.js:36 Mon Nov 29 2021
NMonthsAgo.js:36 Fri Oct 29 2021
NMonthsAgo.js:36 Wed Sep 29 2021
NMonthsAgo.js:36 Sun Aug 29 2021
NMonthsAgo.js:36 Thu Jul 29 2021
NMonthsAgo.js:36 Tue Jun 29 2021
NMonthsAgo.js:36 Sat May 29 2021
NMonthsAgo.js:36 Thu Apr 29 2021
NMonthsAgo.js:36 Mon Mar 29 2021 <=== Mars is returned twice... 
NMonthsAgo.js:36 Mon Mar 01 2021 <=== Mars is returned twice...
NMonthsAgo.js:36 Mon Feb 01 2021
NMonthsAgo.js:36 Fri Jan 01 2021
NMonthsAgo.js:36 Wed Dec 29 2021