Increment JavasScript date object for next month when days are increased?

Question

Is there a simple solution to auto increment the month of the date object when days are added via getDate?

I need to add 2 days to a user supplied date, for example if the user's entered value is 2014-11-16 it returns 2014-11-18.

I have this working in the below example, but the problem is if a user supplies a date at the end of the month, for example 2014-11-30 it will return 2014-11-32 (November only has 30 days) instead of rolling into the next month, it should be 2014-12-02.

It also does not increment to a new year as well.

 var actualDate = new Date(arrive);

        var year = actualDate.getFullYear();
        var monthy = actualDate.getMonth()+1;
        var days = actualDate.getDate()+2;
        var out = year + '-' + (monthy < 10 ? '0' : '') + monthy + '-' + days;

http://jsfiddle.net/bubykx1t/

Answer 1

Just use the setDate() method.

var actualDate = new Date(arrive);
actualDate.setDate(actualDate.getDate() + 2);

Check out this link

Answer 2

You can create new Date objects based on the number of milliseconds since January 1, 1970, 00:00:00 UTC. Since the number of milliseconds in a minute, hour, day, week are set we can add a fixed amount to the current time in order to get a time in the future. We can forget about what day of the month, or year it is as it's inherent in the number of milliseconds that have passed since 1970. This will keep adjust to days months and years correctly.

var numberOfDaysToIncrement = 7;
var offset = numberOfDaysToIncrement * 24 * 60 * 60 * 1000;

var date = new Date();
var dateIncremented = new Date(date.getTime() + offset);