[jdk8u] RFR: 8339644: Improve parsing of Day/Month in tzdata rules

[Dmitry Cherepanov]

On Tue, 10 Dec 2024 19:11:17 GMT, Dmitry Cherepanov <dcherepanov at openjdk.org> wrote:

> The backport is a prerequisite for timezone data update to 2024b. Targeting the PR to jdk8u repo (January release).
> 
> The change doesn’t apply cleanly. In JDK9, JDK-8042369 rewrote the builder classes but it’s too large to backport to 8u so I adopted 11u backport for 8u codebase. The test change applies cleanly after path reshuffling except copyright year.
> 
> Testing: jtreg tests (java/text/Format java/util/TimeZone sun/util/calendar sun/util/resources). Sanity checked that tzdata-2024b (rearguard version) fails to build (“Unknown month: April”) without the changes and builds with the changes. 
> 
> Thanks.

Thanks for reviewing this. Added approval request to this bug.

Yes, I plan to backport 2024b to 8u442 and there are two other changes ([JDK-8339803](https://bugs.openjdk.org/browse/JDK-8339803) and [JDK-8340552](https://bugs.openjdk.org/browse/JDK-8340552)) that makes sense to consider for inclusion in 8u442. I'll try to prepare PRs today or tomorrow.

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PR Comment: https://git.openjdk.org/jdk8u/pull/64#issuecomment-2559303806