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https://issues.apache.org/jira/browse/HIVE-22099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915872#comment-16915872
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Adam Szita commented on HIVE-22099:
-----------------------------------
[~klcopp] I've looked into those - yes there is an issue with them as well but
only for dates between 1582.10.05-1582.10.14 - and it has been like this in the
past as well, even before HIVE-20007.
So I think they won't be touched with this change, but we should definitely
track that and fix in the future.
> Several date related UDFs can't handle Julian dates properly since HIVE-20007
> -----------------------------------------------------------------------------
>
> Key: HIVE-22099
> URL: https://issues.apache.org/jira/browse/HIVE-22099
> Project: Hive
> Issue Type: Bug
> Reporter: Adam Szita
> Assignee: Adam Szita
> Priority: Major
> Attachments: HIVE-22099.0.patch, HIVE-22099.1.patch,
> HIVE-22099.2.patch, HIVE-22099.3.patch, HIVE-22099.4.patch, HIVE-22099.5.patch
>
>
> Currently dates that belong to Julian calendar (before Oct 15, 1582) are
> handled improperly by date/timestamp UDFs.
> E.g. DateFormat UDF:
> Although the dates are in Julian calendar, the formatter insists to print
> these according to Gregorian calendar causing multiple days of difference in
> some cases:
>
> {code:java}
> beeline> select date_format('1001-01-05','dd---MM--yyyy');
> +----------------+
> | _c0 |
> +----------------+
> | 30---12--1000 |
> +----------------+{code}
> I've observed similar problems in the following UDFs:
> * add_months
> * date_format
> * day
> * month
> * months_between
> * weekofyear
> * year
>
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