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 see this is an old thread - but adding this since I had a similar requirement recently - This gives the actual difference in millis based on the CURRENT time(millis from epoch).

    TimeZone.getTimeZone("America/New_York").getOffset(Calendar.getInstance().getTimeInMillis())