MomentJS - How to get last day of previous month from date?
Simply add a endOf('month') to your calls:
var dateFrom = moment(dateFrom).subtract(1,'months').endOf('month').format('YYYY-MM-DD');
http://jsfiddle.net/r42jg/327/
An even easier solution would be to use moment.date(0). the .date() function takes the 1 to n day of the current month, however, passing a zero or negative number will yield a dates in the previous month.
For example if current date is February 3rd:
var _date = moment(); // 2018-02-03 (current day)
var _date2 = moment().date(0) // 2018-01-31 (start of current month minus 1 day)
var _date3 = moment().date(4) // 2018-02-04 (4th day of current month)
var _date4 = moment().date(-4) // 2018-01-27 (start of current month minus 5 days)
console.log(_date.format("YYYY-MM-DD"));
console.log(_date2.format("YYYY-MM-DD"));
console.log(_date3.format("YYYY-MM-DD"));
console.log(_date4.format("YYYY-MM-DD"));<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.js"></script>