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

Adding Months to a Date in JavaScript

JavaScript offers a built-in solution to effortlessly add months to a given date. The task of handling year roll-overs or varied month lengths can be left to the function, ensuring a seamless experience.

To leverage this feature, consider the following function:

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

This function takes two arguments: the date and the number of months to add. It begins by storing the current day of the month in the variable d. Subsequently, it adds the desired number of months to the date. If this causes the day of the month to change, the date is adjusted to the last day of the new month.

To illustrate the function's functionality, consider the following examples:

• Adding 12 months to February 29, 2016 results in February 28, 2017.
• Subtracting 1 month from January 1, 2017 results in December 1, 2016.
• Subtracting 2 months from January 31, 2017 results in November 30, 2016.
• Adding 2 months to December 31, 2016 results in February 28, 2017.

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