Javascript's Date.getTimezoneOffset()

Question

I\'m trying to compare a GMT time offset from the operating system to a GMT time offset from Javascript\'s Date.getTimezoneOffset(). The problem is windows gives an offset b

Answer 1

Why not call getTimezoneOffset on a date where you know daylight saving time is not in force?

javascript:alert(new Date('1/1/2009').getTimezoneOffset())

That will give 300 (5 hours).