Javascript Date issue, incorrect timezone

Question

I got this strange JavaScript bug that I can seem to work arround or fix.

I am using some code to make 2 JavaScript dates, to insert events into a calendar component. The dates are built the following way:

var endDate = new Date();
var startDate = new Date();

startDate.setDate(startDateDay);
startDate.setMonth(startDateMonth);
startDate.setFullYear(startDateYear);
startDate.setHours(2, 0, 0, 0);

endDate.setDate(endDateDay);
endDate.setMonth(endDateMonth);
endDate.setFullYear(endDateYear);
endDate.setHours(2, 0, 0, 0);

So, the dates are built using integers. These integers are determined by input, and using the debugger I can see 100% positive they are coming in correctly. Now, ill describe 3 walkthroughs, 2 where it goes correctly and 1 where it goes wrong.

Using the following input:

endDateDay = 20
endDateMonth = 9
endDateYear = 2014

Gives the following date object as result:

Tue Oct 20 2014 02:00:00 GMT+0200 (W. Europe Daylight Time)

Using this input:

endDateDay = 13
endDateMonth = 9
endDateYear = 2014

Gives the following date object as result:

Tue Oct 13 2014 02:00:00 GMT+0200 (W. Europe Daylight Time)

Now, using this input:

endDateDay = 27
endDateMonth = 9
endDateYear = 2014

Gives the following date object as result:

Mon Oct 27 2014 02:00:00 **GMT+0100** (W. Europe Standard Time)

As you can see, for some strange reason the TimeZone is off. This gives errors in my application, and I need to find a way to get it fixed. Though, I cannot find any solution to it, let alone understand why it is actually happening.

PS: I am using Google Chrome

In what way is it off? The clocks in Western Europe go back to standard time on October 26th... what did you expect, and why? — Jon Skeet
– Jon Skeet, Commented Oct 8, 2014 at 11:54
Look at the tiemzones, one is Daylight time, the other is Standard time (though the timezone names may be different to what you're used to). — RobG
– RobG, Commented Oct 8, 2014 at 12:20

Caspar van Tergouw · Accepted Answer · 2014-10-08 13:37:26Z

2

The answer was indeed the difference in the daylight savings time, which I completly oversaw. Thanks to finding this out I also found a solution to my problem.

I used this link to further assist me, might it help someone in the future: http://javascript.about.com/library/bldst.htm

Cheers!

answered Oct 8, 2014 at 13:37

Caspar van Tergouw

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