Javascript new Date returning wrong year

Question

Using Chrome and and in the console new Date(2015, 12, 20) will return the following in the Chrome console window...

Wed Jan 20 2016 00:00:00 GMT-0500 (Eastern Standard Time)

This also occurs in my javascript (js) file.

I have also tried parseInt with the same result

var month = parseInt(valueUnwrapped.getUTCMonth() + 1); //months from 1-12
var day = parseInt(valueUnwrapped.getUTCDate());
var year = parseInt(valueUnwrapped.getUTCFullYear());
var dte = new Date(year, month, day);

who is going to find the zero month dupe? – epascarello Dec 24 '15 at 16:52 — epascarello, Dec 24 '15 at 16:52
Drop the ` + 1` from the month line – epascarello Dec 24 '15 at 16:54 — epascarello, Dec 24 '15 at 16:54
@epascarello sometimes it's easier to just answer it. – doogle Dec 24 '15 at 16:56 — doogle, Dec 24 '15 at 16:56

score 8 · Accepted Answer · answered Dec 24 '15 at 16:49

8

month value is a 0-based number, 0 being January. If it goes beyond 11, the date rolls over.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date

answered Dec 24 '15 at 16:49

doogle

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True as it is, this defies expectation or convention. Every other language I've ever encountered uses 1-12 for a numeric month value. – Flynn1179 Dec 24 '15 at 16:53
No argument there. I only knew this off hand because I ran into the same problem a couple months back and thought "well that's stupidly unintuitive" – doogle Dec 24 '15 at 16:55
Ironically, so did the OP, judging by the first line of the code fragment. – Flynn1179 Dec 24 '15 at 16:56

score 0 · Answer 2 · answered Dec 24 '15 at 16:52

0

new Date("2015, 12, 20")

Can you try this instead?

answered Dec 24 '15 at 16:52

CFNinja

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Can you explain your down vote as common courtesy? Otherwise, it makes no sense whatsoever! – CFNinja Jan 23 '16 at 23:02
someone trolling? My answer was downvoted as well without comment. – doogle Jan 25 '16 at 17:03

Javascript new Date returning wrong year

2 Answers2