Date.getTimezoneOffset returns a non integer value

Question

The following line in my code:

var timezoneoffset = new Date().getTimezoneOffset();

returns -120.14933013916015.

I was expecting that the return value will be 120, and in general, that the value is always an integer.

Can anyone explain this? Right now it seems like I'll need to perform a round operation on the result.

Answer 1

I have tried everything I can think of, and cannot reproduce the problem you are reporting.

The only thing I can think of is that something else in your code is modifying the Date prototype. Perhaps you are using some date/time library that you didn't tell us about?

Please try reproducing the problem in a clean empty console.

• Type about:blank in the URL bar
• Press F12 for developer tools
• Go to the "Console" tab
• Type new Date().getTimezoneOffset() into the console.

Does it still show the decimals?

• If yes, then there's a bug in IE or Windows
• If no, then something in your other code was mucking with the Date prototype.