Answers for "js reduce date month of 1 month"

minus month javascript date

var d = new Date("January 14, 2012");
console.log(d.toLocaleDateString());
d.setMonth(d.getMonth() - 3);
console.log(d.toLocaleDateString());

add one month to date javascript

// d - is a moment() call
addOneMonth: function (d) {
    let fm = moment(d).add(1, 'M');
    let fmEnd = moment(fm).endOf('month');
    return d.date() != fm.date() && fm.isSame(fmEnd.format('YYYY-MM-DD')) ? fm.add(1, 'd') : fm;
};