How to calulate number of months between two dates in javascript?

How would I work out the difference for two Date() objects in JavaScript, while only return the number of months in the difference?.

I struggle alot to find the difference between two dates and finally alots of googling i find the below solution :

var firstdate = new Date("2017/02/15");
var seconddate = new Date(); //current date

// Find no of months between years.
var months = (seconddate.getFullYear() - firstdate.getFullYear()) * 12;

// Find no of months between firstdate & seconddate Months.
months += seconddate.getMonth() - firstdate.getMonth();

// Subtract one month if seconddate date is less that firstdate.
months = (seconddate.getDate() < firstdate.getDate()) ? months-- : months;


alert("Total number of months between firstdate and seconddate ="+months);

You can check the above code. You will return the difference between the "2017/02/15" and Current date in months.

Output :

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Chears :)
Happy coding..