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https://issues.apache.org/jira/browse/SPARK-31408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan updated SPARK-31408:
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Summary: Build Spark’s own datetime pattern definition (was: Build Spark’s
own Datetime patterns)
> Build Spark’s own datetime pattern definition
> ---------------------------------------------
>
> Key: SPARK-31408
> URL: https://issues.apache.org/jira/browse/SPARK-31408
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuanjian Li
> Priority: Major
> Fix For: 3.0.0
>
>
> This is an umbrella ticket for building Spark's own Datetime patterns and
> related works.
> In Spark version 2.4 and earlier, datetime parsing and formatting are
> performed by the old Java 7 `SimpleDateFormat` API. Since Spark 3.0, we
> switch to the new Java 8 `DateTimeFormatter` to use the Proleptic Gregorian
> calendar, which is required by the ISO and SQL standards.
> However, there are some datetime patterns not compatible between Java 8 and
> Java 7 APIs, and it's fragile to rely on the JDK API to define Spark's
> behavior. We should build our own Datetime patterns, which is compatible with
> Spark 2.4 (the old Java 7 `SimpleDateFormat` API).
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