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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-26651) Use Proleptic Gregorian calendar
Date Sat, 02 Feb 2019 03:21:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-26651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hyukjin Kwon updated SPARK-26651:
---------------------------------
    Fix Version/s:     (was: 3.0.0)

> 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
>              Labels: ReleaseNote
>
> 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.
> *Release note:*
> Spark 3.0 has switched on Proleptic Gregorian calendar in parsing, formatting, and converting
dates and timestamps as well as in extracting sub-components like years, days and etc. It
uses Java 8 API classes from the java.time packages that based on [ISO chronology |https://docs.oracle.com/javase/8/docs/api/java/time/chrono/IsoChronology.html].
Previous versions of Spark performed those operations by using [the hybrid calendar|https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html]
(Julian + Gregorian). The changes might impact on the results for dates and timestamps before
October 15, 1582 (Gregorian).



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