Adding dates in JavaScript in one line

Question

I'm trying to perform date manipulations using JavaScript on a single line, and I'm having problems with the year (not the month or day). I got the idea from this link. Am I missing something?

The code is as follows:

var newyear = new Date((new Date()).getYear(), (new Date()).getMonth(), (new Date()).getDate()+5).getFullYear();
document.write(newyear);

This gives me "110".

I'm not sure why? Thanks!

Oddly, works in IE 7, yielding "2010". Haven't bothered to test in other browsers. — jball, Feb 25 '10 at 21:15
A little testing shows that IE treats both `getYear()` and `getFullYear()` identically. More reasons not to use deprecated functions. — jball, Feb 25 '10 at 21:22

score 15 · Accepted Answer · edited May 23 '17 at 11:52

15

(new Date()).getYear()

You should use getFullYear() here. getYear() in JS means (year − 1900).

edited May 23 '17 at 11:52

Community

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answered Feb 25 '10 at 21:11

kennytm

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score 1 · Answer 2 · answered Feb 25 '10 at 21:12

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var newyear = new Date((new Date()).getFullYear(), (new Date()).getMonth(), (new Date()).getDate()+5).getFullYear();

answered Feb 25 '10 at 21:12

zincorp

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peller · Answer 3 · 2010-02-25T22:09:29.073

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Y2K bug aside, this is a simpler expression:

var newyear = new Date(new Date().setDate(new Date().getDate()+5)).getFullYear()

Date objects are relatively expensive and you can do this with a single Date object and less code if you don't assume it has to be a single expression.

var d = new Date(); d.setDate(d.getDate()+5); var newyear = d.getFullYear()

edited Feb 25 '10 at 22:09

answered Feb 25 '10 at 21:58

peller

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Adding dates in JavaScript in one line

3 Answers3