Java: Calculating time zone difference

Question

How do I get the time difference from GMT for a specific date and time zone in Java?

Determining whether a specific time zone is in DST is quite straight-forward:

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Answer 1

I suggest to add summer/winter time offset to getRawOffset:

    TimeZone tz1 = TimeZone.getTimeZone("GMT");
    TimeZone tz2 = TimeZone.getTimeZone("America/New_York");
    long timeDifference = tz1.getRawOffset() - tz2.getRawOffset() + tz1.getDSTSavings() - tz2.getDSTSavings();