[tz] [PATCH] tz-link.html: update Oracle Java tzupdater README URL

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sun Oct 18 05:39:41 UTC 2020

On 2020-10-17 19:02, Paul Eggert wrote:
> On 10/17/20 9:32 AM, Brian Inglis wrote:
>> Oracle Java tzupdater README URL in tz-link.html has been changed and is
>> currently being redirected; update it in case that does not continue:
> Thanks for the heads-up. Fixing this prompted me to mention the TZUpdater
> license (which I was not aware of), since that's done for most other software we
> cite. Also, I modernized the description of Oracle JDK and OpenJDK, as well as
> the Python description in the light of Python 3.9 (which if I'm not mistaken,
> makes pytz obsolescent).
> I looked into other tools for updating Java from tzdb. It's quite a zoo.
> tz-link.html currently lists ICU, Joda-Time, JTZU, ThreeTen-Extra, and Time4A
> which all appear to be active projects. It also lists the following projects,
> all links that I added in July 2019 but which I'm not as sure about today:
>  * IANA Updater, intended for Liberica JDK/JRE, last updated February 2019.
>  * ZIUpdater, intended for Zulu Enterprise, Zulu Community, Zulu Embedded, and
> Zing, last updated July 2019.
>  * tzdbgen, a backport of some OpenJDK 8 (2014) code to OpenJDK 6 (2009), last
> updated June 2017. This no longer seems to work
> <https://github.com/akashche/tzdbgen/issues/4>.
> Given the above, the attached proposed patch also stops mentioning tzdbgen as it
> appears to be abandoned. I'll cc. this email to tzdbgen's author Alex
> Kashchenko, though, in case I'm wrong. If anyone knows IANA Updater and
> ZIUpdater's status, I'd appreciate the info; presumably they exist mostly
> because of TZUpdater's license but the licensing situation can be murky in this
> area.

An upgrade mentioned on the new Oracle Java Tzupdater page allows the Oracle
Java Tzupdater to update other non-Oracle JVMs using compatible tz data.
IIRC Joda time core became java.time integrated into Jave SE 8 JDK updating
calendar, tz, and DST handling; and ThreeTen Android Backport added that support
to the Google Android platform, and the core is becoming Android java.time.

[BTW: DUT1 predictions appear to keep floating around the same range for at
least another year]

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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