[jira] [Resolved] (SPARK-31221) Rebase all dates/timestamps in conversion in Java types

["Wenchen Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-31221?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-31221.
---------------------------------
    Fix Version/s: 3.0.0
       Resolution: Fixed

Issue resolved by pull request 27980
[https://github.com/apache/spark/pull/27980]

> Rebase all dates/timestamps in conversion in Java types
> -------------------------------------------------------
>
>                 Key: SPARK-31221
>                 URL: https://issues.apache.org/jira/browse/SPARK-31221
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Maxim Gekk
>            Assignee: Maxim Gekk
>            Priority: Major
>             Fix For: 3.0.0
>
>
> Currently, the fromJavaDate(), toJavaDate(), toJavaTimestamp() and fromJavaTimestamp() methods of DateTimeUtils perform rebase only dates before Gregorian cutover date 1582-10-15 assuming that Gregorian calendar has the same behavior in Java 7 and Java 8 API. The assumption is incorrect, in particular, in getting zone offsets, for instance:
> {code:scala}
> scala> java.time.ZoneId.systemDefault
> res16: java.time.ZoneId = America/Los_Angeles
> scala> java.sql.Timestamp.valueOf("1883-11-10 00:00:00").getTimezoneOffset / 60.0
> warning: there was one deprecation warning; re-run with -deprecation for details
> res17: Double = 8.0
> scala> java.time.ZoneId.of("America/Los_Angeles").getRules.getOffset(java.time.LocalDateTime.parse("1883-11-10T00:00:00"))
> res18: java.time.ZoneOffset = -07:52:58
> {code}
> Java 7 is not accurate, America/Los_Angeles changed time zone shift from
> {code}
> -7:52:58
> {code}
> to
> {code}
> -8:00 
> {code}
> The ticket aims to perform rebasing for any dates/timestamps independently from calendar cutover date.



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