Javascript getDay() returns wrong result

Question

My code

var d = new Date("2014-09-01"); 
var days = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
days[d.getDay()]

I expects days[d.getDay()] returns Monday but It got Sunday

I am located in Pacific Time California zone

Do I miss something?

It returns monday for me, as it should -> http://jsfiddle.net/s1bse8fm/ — adeneo, Aug 26 '14 at 14:54

score 1 · Answer 1 · answered Aug 26 '14 at 15:02

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The string you're passing to the constructor, "2014-09-01" does not indicate a time zone. On both Chrome and Firefox (based on my tests right now), this seems to be interpreted as a GMT date. When you call getDay(), the day is given in your local time zone.

So in my case, since I am in California, the date 2014-09-01, which is midnight in GMT, is actually 5pm on August 31 in PDT.

answered Aug 26 '14 at 15:02

Dan Tao

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How to I include timezone in the passing in string `2014-09-01`? – icn Aug 26 '14 at 16:00
@icn - var d = new Date(aYear, aMonth, aDay); d.setTime( d.getTime() + d.getTimezoneOffset()*60000 ); – BA TabNabber Aug 26 '14 at 16:38

score 1 · Accepted Answer · edited May 23 '17 at 12:27

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Dan Tao is right, here's how you can fix the missing timezone.

var d = new Date("2014-09-01"); 
var days = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
d.setTime( d.getTime() + d.getTimezoneOffset()*60000 );

http://jsfiddle.net/s1bse8fm/2/

Related: How do you create a JavaScript Date object with a set timezone without using a string representation

edited May 23 '17 at 12:27

Community

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answered Aug 26 '14 at 16:43

BA TabNabber

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Javascript getDay() returns wrong result

2 Answers2