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https://issues.apache.org/jira/browse/LANG-59?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923289#action_12923289
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Maxi commented on LANG-59:
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The problem persist in both versions: 2.4 and 2.5
DateUtils.trucate() does not work properly with daylight saving time.
e.g.:
Date: 2010/10/10 05:16:14.0
DateUtils.truncate(date, Calendar.DATE) : Sun Oct 10 01:00:00 CLST 2010
Instead of showing 10/10/2010, it shows 10/10/2010 01:00:00
> [lang] DateUtils.truncate method is buggy when dealing with DST switching
> hours
> -------------------------------------------------------------------------------
>
> Key: LANG-59
> URL: https://issues.apache.org/jira/browse/LANG-59
> Project: Commons Lang
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Operating System: Windows XP
> Platform: Other
> Reporter: Li Zhang
> Fix For: 2.2
>
> Attachments: lang_issue_59.txt
>
>
> Try to truncate 2004-10-31 01:00:00 MDT by hour and you'll actually get
> 2004-10-
> 31 01:00:00 MST, which is one hour after the input hour.
> // truncate 2004-10-31 01:00:00 MDT
> Date oct31_01MDT = new Date(1099206000000L);
> Date result = DateUtils.truncate(oct31_01MDT, Calendar.HOUR_OF_DAY);
> assertEquals(oct31_01MDT, result);
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