Comments on: Daylight Saving Time (DST) Detect

By: Mo Gryph

Mo Gryph — Mon, 15 Aug 2011 14:22:00 +0000

Hi Jon,
At first view, using the hard coded dates seems like a sound idea. However, the problem with the approach of testing against known dates, as we saw a few years ago- DST known dates change on occasion (albeit rare), and different regions use different countries have their own DST dates. Michael’s idea appears to work without concern of this.

By: MichaelApproved

MichaelApproved — Wed, 04 May 2011 07:19:00 +0000

How do you know if the user is currently observing Daylight Saving Time or not? getTimezoneOffset() doesn’t tell you that and includes the change in time in the result. With your example Eastern Time can be -3 or -4 depending on the time of year.

My function is designed to ignore DST and return the correct offset regardless of DST.

By: Isaac My Hero

Isaac My Hero — Wed, 04 May 2011 05:44:00 +0000

Hello… This is complicated. To get the correct time from your users, try these two lines of code, provided the user has the correct time zone set in his/her computer, it should be just fine.

var userTime = new Date();
var time_zone = userTime.getTimezoneOffset()/-60;

By: Isaac My Hero

Isaac My Hero — Wed, 04 May 2011 05:41:00 +0000

By: Jon

Jon — Wed, 29 Dec 2010 11:57:00 +0000

Awesome work. We have similar ideas as you can see in my script jsTimezoneDetect. https://bitbucket.org/pellepim/jstimezonedetect.

My script however checks known dates when DST has started. Have a look if you feel like it and tell me what you think.

By: Perumal

Perumal — Wed, 07 Apr 2010 23:54:00 +0000

Thank you very much Micheal.

I was searching for this the whole day and found out your solution.

Very helpful!

By: MichaelApproved

MichaelApproved — Mon, 05 Apr 2010 20:19:00 +0000

Good point. I selected the MIT License which should allow you to use the code in a very liberal manner.

By: Jay Sullivan

Jay Sullivan — Mon, 05 Apr 2010 19:16:00 +0000

Thank you for making this; this is exactly what I’m looking for. I’d like to make use of this, but I don’t see a license. Any chance you could place it into public domain?