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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12706) Incorrect output from from_utc_timestamp()/to_utc_timestamp when local timezone has DST
Date Tue, 12 Jul 2016 19:50:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15373579#comment-15373579
] 

Jason Dere commented on HIVE-12706:
-----------------------------------

I noticed you already commented in HIVE-14161 about difference between EST vs America/New_York,
but I think the case was similar here as well, the time zone had to be a timezone that actually
switches during DST (like America/New_York) to see the issue.

> Incorrect output from from_utc_timestamp()/to_utc_timestamp when local timezone has DST
> ---------------------------------------------------------------------------------------
>
>                 Key: HIVE-12706
>                 URL: https://issues.apache.org/jira/browse/HIVE-12706
>             Project: Hive
>          Issue Type: Bug
>          Components: UDF
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>             Fix For: 2.0.0
>
>         Attachments: HIVE-12706.1.patch
>
>
> Getting wrong output with the local timezone set to PST (which has DST). I don't think
this happens when the local timezone does not observe DST.
> {noformat}
> select from_utc_timestamp('2015-03-28 17:00:00', 'Europe/London')
> 2015-03-28 17:00:00
> select from_utc_timestamp('2015-03-28 18:00:00', 'Europe/London')
> 2015-03-28 19:00:00  <= Wrong, should be 2015-03-28 18:00:00
> select from_utc_timestamp('2015-03-28 19:00:00', 'Europe/London')
> 2015-03-28 20:00:00 <= Wrong, should be 2015-03-28 19:00:00
> {noformat}
> Also to_utc_timestamp():
> {noformat}
> select to_utc_timestamp('2015-03-28 17:00:00', 'Europe/London')
> 2015-03-28 17:00:00
> select to_utc_timestamp('2015-03-28 18:00:00', 'Europe/London')
> 2015-03-28 17:00:00 <= Wrong
> select to_utc_timestamp('2015-03-28 19:00:00', 'Europe/London')
> 2015-03-28 18:00:00 <= Wrong
> select to_utc_timestamp('2015-03-28 20:00:00', 'Europe/London')
> 2015-03-28 19:00:00 <= Wrong
> {noformat}



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