How Can I Easily Add or Subtract Months to a Date in JavaScript?

Add Months to Dates with JavaScript

If you need to increment or decrement a date by a specified number of months in JavaScript, there's a built-in solution that caters to your needs.

Function to Add Months to a Date

To simplify the process, you can utilize the following function that handles year roll-overs and month length variations:

function addMonths(date, months) {
    var d = date.getDate();
    date.setMonth(date.getMonth() + +months);
    if (date.getDate() != d) {
      date.setDate(0);
    }
    return date;
}

Example Usage

To add or subtract months from a date, simply call the function with the original date and the number of months to add or subtract.

// Add 12 months to 29 Feb 2016
var newDate = addMonths(new Date(2016,1,29),12);

// Subtract 1 month from 1 Jan 2017
newDate = addMonths(new Date(2017,0,1),-1);

// Add 2 months to 31 Dec 2016
newDate = addMonths(new Date(2016,11,31),2);

By leveraging this function, you can effortlessly manipulate dates in your JavaScript applications without having to worry about the details of month lengths or year roll-overs.

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