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From "Rafael Sisto (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LANG-850) DateUtils.truncatedCompareTo not working properly with DST timezones
Date Wed, 07 Nov 2012 01:24:12 GMT

    [ https://issues.apache.org/jira/browse/LANG-850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492034#comment-13492034
] 

Rafael Sisto commented on LANG-850:
-----------------------------------

I agree with that (the objects aren't the same), but shouldn't the months of both calendars
match? Which is the same as saying that the last line should return 0, right?

As a clear example, the month of 11-6-2012 (GMT-3) is the same as the month of 11-20-2012
(GMT-7), right? 
What am I thinking wrong here?
                
> DateUtils.truncatedCompareTo not working properly with DST timezones
> --------------------------------------------------------------------
>
>                 Key: LANG-850
>                 URL: https://issues.apache.org/jira/browse/LANG-850
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.time.*
>    Affects Versions: 3.1
>         Environment: java version "1.6.0_32"
> Windows 7
> Timezone: America/Montevideo
>            Reporter: Rafael Sisto
>            Priority: Minor
>              Labels: patch
>
> The method truncatedCompareTo doesn't work properly when comparing 2 calendars in a different
timezone (when one of them is "America/Montevideo", the same as the machine running the test).
> Here is the sample code to reproduce.
> The Timezone of the computer has to be set to UTC-3 Montevideo, with DST.
> {quote}
> GregorianCalendar c1 = new GregorianCalendar(2012,10,6);
> System.out.println("The time: " + c1.getTime());
> c1.setTimeZone(TimeZone.getTimeZone("America/Montevideo"));
> Calendar truncate1 =  DateUtils.truncate(c1, Calendar.MONTH);
> System.out.println("America/Montevideo then truncated: " + truncate1.getTime());
> GregorianCalendar c2 = new GregorianCalendar(2012,10,6);
> c2.setTimeZone(TimeZone.getTimeZone("GMT"));
> Calendar truncate2 = DateUtils.truncate(c2, Calendar.MONTH);
> System.out.println("GMT then truncated: " + truncate2.getTime());
> 		
> System.out.println("Truncated compare: " + DateUtils.truncatedCompareTo(c1, c2, Calendar.MONTH));
> {quote}
> The output:
> {quote}
> The time: Tue Nov 06 00:00:00 UYST 2012
> America/Montevideo then truncated: Thu Nov 01 00:00:00 UYST 2012
> GMT then truncated: Wed Oct 31 22:00:00 UYST 2012
> Truncated compare: 1
> {quote}
> A suggestion is to change the TimeZone of both calendars before truncating. For example,
setting both to TimeZone.getDefault().

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