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https://issues.apache.org/jira/browse/LANG-1003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov reopened LANG-1003:
----------------------------------


Reopening because you forgot to document those runtime exception with 
{{@throws}}.

> DurationFormatUtils are not able to handle negative durations/periods
> ---------------------------------------------------------------------
>
>                 Key: LANG-1003
>                 URL: https://issues.apache.org/jira/browse/LANG-1003
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.text.*
>    Affects Versions: 3.3.2
>            Reporter: Michael Osipov
>            Assignee: Benedikt Ritter
>            Priority: Critical
>             Fix For: 3.4
>
>
> It spits out complete garbage.
> {code}
> System.out.println(DurationFormatUtils.formatDurationHMS(-3454));
> System.out.println(DurationFormatUtils.formatPeriodISO(4000, 3000));
> {code}
> {noformat}
> 0:00:-3.-454
> P-1Y11M30DT23H59M59.000S
> {noformat}
> It should throw an {{IllegalArgumentException}} if duration is < 0 or period 
> diff is < 0.



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