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https://issues.apache.org/jira/browse/SPARK-26651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16754438#comment-16754438
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Sean Owen commented on SPARK-26651:
-----------------------------------
You can just tag this with release-notes and add release notes here, if you
like, and open a PR for this JIRA with any additional migration notes. That's
logical too.
> Use Proleptic Gregorian calendar
> --------------------------------
>
> Key: SPARK-26651
> URL: https://issues.apache.org/jira/browse/SPARK-26651
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Maxim Gekk
> Assignee: Maxim Gekk
> Priority: Major
>
> Spark 2.4 and previous versions use a hybrid calendar - Julian + Gregorian in
> date/timestamp parsing, functions and expressions. The ticket aims to switch
> Spark on Proleptic Gregorian calendar, and use java.time classes introduced
> in Java 8 for timestamp/date manipulations. One of the purpose of switching
> on Proleptic Gregorian calendar is to conform to SQL standard which supposes
> such calendar.
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