How to Add Days to a Date in JavaScript?

Custom Date Function to Add Days in JavaScript

While JavaScript does not have a native .AddDay() function like .NET, we can easily create one using the Date prototype.

Implementation:

Date.prototype.addDays = function(days) {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + days);
    return date;
}

Usage:

To add days to an existing Date object, simply invoke the .addDays() function with the desired number of days.

var date = new Date();

// Add 5 days to the current date
console.log(date.addDays(5));

This will create a new Date object with the specified number of days added to the original date.

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