<i18n dev> RFR: 8364752: Class java.time.Instant cannot parse all ISO 8601 date formats [v7]

[Naoto Sato]

> `Instant.parse()` is expected to use the offset zone pattern `+HH:mm:ss` (as defined by `DateTimeFormatterBuilder.appendOffsetId()`), but it fails to parse hour-only offsets such as `+02`. This is because the actual implementation uses `+HH:MM:ss` as the pattern. While replacing the pattern in the implementation as with the specification would allow hour-only offsets, it would also introduce compatibility issues, i.e., printing would omit the minutes field when it is zero. So, it is preferable to update the specification to match the implementation. A CSR has also been drafted for this change.

Naoto Sato has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains nine additional commits since the last revision:

 - DateTimeFormatterBuilder wording
 - Added non-zero offset test cases
 - Merge branch 'master' into JDK-8364752-Instant-ISO8601
 - Update src/java.base/share/classes/java/time/format/DateTimeFormatter.java
   
   Right. Changing to your suggested wording
   
   Co-authored-by: Roger Riggs <Roger.Riggs at Oracle.com>
 - copyright year update
 - test cases
 - allow all ISO 8601 offsets
 - allow hour-only offsets
 - initial commit

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/26708/files
  - new: https://git.openjdk.org/jdk/pull/26708/files/8bc222af..0d78a520

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26708&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26708&range=05-06

  Stats: 16207 lines in 511 files changed: 8985 ins; 5233 del; 1989 mod
  Patch: https://git.openjdk.org/jdk/pull/26708.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26708/head:pull/26708

PR: https://git.openjdk.org/jdk/pull/26708