const date = new Date('2022-02-13');
const firstDayOfPreviousMonth = new Date(date.getFullYear(), date.getMonth() - 1, 1);
console.log(firstDayOfPreviousMonth.toDateString());
const lastDayOfPreviousMonth = new Date(date.getFullYear(), date.getMonth(), 0);
console.log(lastDayOfPreviousMonth.toDateString());
/*
run:
Sat Jan 01 2022
Mon Jan 31 2022
*/