[jira] [Updated] (LANG-815) DurationFormatUtils.formatPeriod() mis-calculation

["Sebb (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebb updated LANG-815:
----------------------

    Summary: DurationFormatUtils.formatPeriod() mis-calculation  (was: DurationFormatUtils.formatPeriod() miss-calculation)
    
> DurationFormatUtils.formatPeriod() mis-calculation
> --------------------------------------------------
>
>                 Key: LANG-815
>                 URL: https://issues.apache.org/jira/browse/LANG-815
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.time.*
>    Affects Versions: 3.1
>         Environment: JDK 1.7
>            Reporter: Naoya Sugioka
>         Attachments: duration-format.diff
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> Hello,
> I just encountered an issue with DurationFormatUtils.formatPeriod()
> and here I suggest the patch.
> The problem is found when calcurating a duration between  June 30 to August 8.
> Duration must be 1 month and 9 days  (June 30 + 1 month = July 30,
> July 30 + 9 Days = August 8)
> but current logic tells this duration is 1 month and 8 days.
> then I found out the logic to adjust days value if it was negative by
> initial estimate. it uses start date
> (June in above case) but must use prev month of end date (July in
> above case). then days value was
> wrong since getActualMaximum() will return a wrong number.
> thank you,
> -Naoya

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