Determine a user’s timezone

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Determine a user’s timezone
Is there a standard way for a web server to be able to determine a user’s timezone within a web page?
Perhaps from an HTTP header or part of the user-agent string?

-new Date().getTimezoneOffset()/60;

The method getTimezoneOffset() will subtract your time from GMT and return the number of minutes. So if you live in GMT-8, it will return 480.
To put this into hours, divide by 60. Also, notice that the sign is the opposite of what you need – it’s calculating GMT’s offset from your time zone, not your time zone’s offset from GMT. To fix this, simply multiply by -1.

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