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

JavaScript Function to Alter Dates by Months

Developers frequently encounter the need to modify dates by specified months in JavaScript. This task involves considerations such as year roll-overs and varying month lengths. To simplify this process, the JavaScript language provides a built-in function that efficiently handles these complexities.

The addMonths() function accepts two parameters: a date object and a number of months to add or subtract. It adjusts the date by the specified months, ensuring that year changes and month lengths are accounted for.

For instance, to add 12 months to February 29th, 2016, simply execute addMonths(new Date(2016,1,29),12). This will return a date object representing February 28th, 2017.

Conversely, to subtract 1 month from January 1st, 2017, use addMonths(new Date(2017,0,1),-1). This will yield a date object representing December 1st, 2016.

The addMonths() function also handles scenarios with 31-day months. For example, subtracting 2 months from January 31st, 2017, using addMonths(new Date(2017,0,31),-2) will result in a date object representing November 30th, 2016.

Similarly, adding 2 months to December 31st, 2016, via addMonths(new Date(2016,11,31),2) will return a date object for February 28th, 2017, accommodating the year roll-over.

The addMonths() function offers a straightforward and effective way to modify dates by months in JavaScript, addressing challenges like year roll-overs and varying month lengths.

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