get month difference from two dates in javascript code example

Example 1: javascript date difference in months

function monthDiff(d1, d2) {
    var months;
    months = (d2.getFullYear() - d1.getFullYear()) * 12;
    months -= d1.getMonth();
    months += d2.getMonth();
    return months <= 0 ? 0 : months;
}

Example 2: get month in two digit in javascript date

("0" + (this.getMonth() + 1)).slice(-2)