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https://issues.apache.org/jira/browse/HIVE-18358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308920#comment-16308920
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Andrew Sherman commented on HIVE-18358:
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The code that deals with YYYY is just
[SimpleDateFormat|https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html].
I think YYYY is not the same as yyyy. It has a special meaning as 'week in
year'.
[https://stackoverflow.com/questions/15916958/simpledateformat-producing-wrong-date-time-when-parsing-yyyy-mm-dd-hhmm]
> from_unixtime returns wrong year for Dec 31 timestamps with format 'YYYY'
> -------------------------------------------------------------------------
>
> Key: HIVE-18358
> URL: https://issues.apache.org/jira/browse/HIVE-18358
> Project: Hive
> Issue Type: Bug
> Affects Versions: 2.1.0
> Environment: AWS EMR with Hive 2.1.0-amzn-0
> Reporter: Nick Orka
> Labels: timezone
>
> If you use capital Ys as a year format in from_unixtime() it returns next
> year for Dec 31 only. All other days work as intended.
> Here is reproduction code:
> {code:sql}
> hive> select from_unixtime(1514754599, 'YYYY-MM-dd HH-mm-ss'),
> from_unixtime(1514754599, 'yyyy-MM-dd HH-mm-ss');
> OK
> 2018-12-31 21-09-59 2017-12-31 21-09-59
> Time taken: 0.025 seconds, Fetched: 1 row(s)
> hive>
> {code}
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