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How do I update the timezone information for the OpenJDK? Oracle puts out tzupdater but that is bound by their license so I don't want to use it. I'm looking for an open source alternative that will allow me to just update the timezone information and not the entire JRE.
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Azul recently published an open source tool to update TZ data: https://www.azul.com/products/open-source-tools/ziupdater-time-zone-tool/
It works similar to Oracle tzupdater, but has open source (GPLv2 License) license.
Usage: apply it to IANA data package using Java which you want to update:
By this command you will apply changes to timezone to your Java installation.
What does it mean?
Consider next situation: you installed Java a year ago and later a government of certain country changed their laws, e.g. cancelled DST. Your Java installation doesn't know about that yet and may handle time incorrectly for that particular region. Updating timezone data solves that.