RFR: 8339644: Improve parsing of Day/Month in tzdata rules [v3]

[Naoto Sato]

On Fri, 6 Sep 2024 21:49:30 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Fixing TZDB build tool to accommodate full month/day names. Recently released tzdb2024b included (inadvertently) full month name "April", which is allowed by the spec (zic.8), but never used. This will cause build failure of the JDK. The proposed fix is manually tested by modifying the tzdb files to include full month names, and confirmed the successful build of the JDK.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Strictly conforming to the spec

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/20893#issuecomment-2338507731