Question

41

Javascript: setDate(DATE + day) not update month

rated 0 times [ 42] [ 1] / answers: 1 / hits: 25043 / 11 Years ago, tue, june 11, 2013, 12:00:00

I created this function to increment a date (for a jQuery UI Datepicker):

function addDay(date) {

    var moreDay = new Date();

    var decomposed = date.split(-);

    var act = new Date(decomposed[2], decomposed[1], decomposed[0]);

    moreDay.setDate(act.getDate()+1);

    return moreDay;

}

So, it scomposes the date (ex: 12-06-2013 (dd-mm-YYYY)) and put the values into a new Date, after that it addes a day. It works, but the month not change. Example, I changed the function into this:

function addDay() {

    var moreDay = new Date();

    var act = new Date(2013, 7, 3);

    moreDay.setDate(act.getDate()+1);

    alert(moreDay);

}

And it returns Jun 4th 2013.. How it's possible?

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answered 11 Years ago dahlias · Accepted Answer

It's not clear what you want to do with your function. If you want to take a date and add a day, try with this:

function addDay(date) {

    var decomposed = date.split(-),

        moreDay = new Date(decomposed[2], decomposed[1] - 1, decomposed[0]);

    moreDay.setDate(moreDay.getDate() + 1);

    alert(moreDay);

}

Please take note that in common dd-mm-yyyy dates, January is 1, whereas to define a Date object January is 0, hence the - 1.

This alternative should be faster than setDate:

moreDay.setTime(moreDay.getTime() + 864e5);

Or you could define your Date object directly with an added day:

moreDay = new Date(decomposed[2], decomposed[1] - 1, +decomposed[0] + 1);