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From "Nelson Rodrigues (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4107) DATE function returns wrong result for integer argument
Date Sat, 18 Apr 2009 17:47:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700513#action_12700513
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Nelson Rodrigues commented on DERBY-4107:
-----------------------------------------

This problem may be related to DERBY-4106 issue.

> DATE function returns wrong result for integer argument
> -------------------------------------------------------
>
>                 Key: DERBY-4107
>                 URL: https://issues.apache.org/jira/browse/DERBY-4107
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.4.2.0
>         Environment: MS Windows XP Professional Version 2002 Service Pack 2, running
NetBeans IDE 6.5
>            Reporter: Nelson Rodrigues
>            Assignee: Yun Lee
>
> When Derby Reference Manual, version 10.4, lists Derby limitations for DATE is said that
the smallest DATE value is 0001-01-01 and the largest DATE value is 9999-12-31.
> When the same manual explains the DATE function is said that:
> "The argument must be ... a positive number less than or equal to 2,932,897 ... The result
is the date that is n-1 days after January 1, 0001, where n is the integral part of the number."
> Testing for the largest integer returns the expected result:
> select date(2932897) from SYSIBM.SYSDUMMY1   returns 9999-12-31 -> OK
> The problem comes when testing the smallest integer. We get a result different than we
expect:
> select date(1) from SYSIBM.SYSDUMMY1   returns 1970-01-01, but it should have returned
0001-01-01
> The smallest date we get using integer as an argument to date function should be the
same we get when using the smallest string representation as an argument. In other words date(1)
should be equal to date('0001-01-01'). 
> select date('0001-01-01') from SYSIBM.SYSDUMMY1  returns 0001-01-01 -> OK

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