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Add date-time module: Instant vs LocalDateTime vs OffsetDateTime vs ZonedDateTime round-tripped across JVM time zones on H2 and PostgreSQL

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Hibernate 7.4.14.Final (plus an 8.0.0.Beta4 preview run), H2 2.5.252, PostgreSQL 17.11 in Docker.
Same-JVM and cross-zone round trips, @TimeZoneStorage modes, DST gap/overlap, precision
(precision vs secondPrecision), hibernate.jdbc.time_zone, java_time_use_direct_jdbc default flip.
Supersedes the date/time experiments of docs/13 (7.4.5); chapter 13 is unchanged.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b7rnC7jppGGdHGESvy
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asmhatre
2026-10-29 00:56:54 +00:00
committed by Claude
co-authored by Claude Sonnet 5.5
parent c9faf35e61
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@@ -341,6 +341,7 @@ Modules with their own `pom.xml` that run plain Hibernate without the Spring Boo
| Module | What it covers |
|---|---|
| [`date-time`](date-time/) | `Instant` vs `LocalDateTime` vs `OffsetDateTime` vs `ZonedDateTime` round-tripped across JVM time zones on H2 and PostgreSQL: what survives, `@TimeZoneStorage`, DST gaps, precision, and the Hibernate 8 `java_time_use_direct_jdbc` default (Hibernate `7.4.14.Final`, Hibernate `8.0.0.Beta4` preview) |
| [`h8-preview`](h8-preview/) | Hibernate ORM 8 beta against Hibernate 7: what breaks |
| [`inheritance`](inheritance/) | `SINGLE_TABLE` vs `JOINED` vs `TABLE_PER_CLASS` vs `@MappedSuperclass`: generated DDL, SQL, failures and timings (Hibernate `7.4.13.Final`) |
| [`locking`](locking/) | Optimistic (`@Version`, retries) vs pessimistic (`PESSIMISTIC_WRITE`, `NOWAIT`, `SKIP LOCKED`) locking, lost updates and deadlocks on H2 (Hibernate `7.4.14.Final`) |