Javascript: Getting invalid Time Zone

I have found following piece of code for client time zone:

Code:

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alert((new Date().getTimezoneOffset()/60) * -1)

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It works fine for positive time zone. But when set negative time zone on system. I got one hour later e.g. if i set -8 time zone on system then i got -7.
ANY IDEA HOW CAN I RESOLVE IT?

getTimezoneOffset only gets hoe many hours you are off of GMT. It will never produce a negative. If you know that you are in need of a negative just use the following.

Code:

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var d = new Date();
offsetGMT = -(d.getTimezoneOffset() / 60);

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Ok i resolve the problem. It is showing me one hour difference because on my system "Automatically adjust clock for day light saving" is on.