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https://issues.apache.org/jira/browse/OFBIZ-715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583483#action_12583483
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Valentina Sirkova commented on OFBIZ-715:
-----------------------------------------

Hi,

 I got interested in this issue and would like to contribute on it but i need 
your guidance about one thing. I read a lot of stuff on the net about leap 
years etc and got the impression it is complicated yet intriguing matter. Here 
is the question: 
 How do you define year: By standard it is 365 or 366(leap) days depending on 
the occurrence of Feb 29. I read in your comments that the period between Feb 
28 and Feb 29(leap year) is 1 year(366 days).
 What is the period 28 Feb and 28 Feb(leap year) then? This is 365 days is it 
one year again? If yes then if we want to find the difference between 
2003-02-28 and 2004-02-29; 2003-02-28 and 2004-02-28 this would yeld 1 year in 
both situations?

regards: Valentina

> Utils for doing date calculations based on timeUomIds
> -----------------------------------------------------
>
>                 Key: OFBIZ-715
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-715
>             Project: OFBiz
>          Issue Type: Improvement
>          Components: framework
>            Reporter: Andrew Sykes
>            Assignee: Jacques Le Roux
>            Priority: Minor
>         Attachments: elapsed_time.patch, UtilDateTime.java.patch, 
> UtilDateTime.java.patch
>
>
> 6 new methods, 
> 1/ adjustDateTime (3 methods) adjusts either a Timestamp Date or Calendar by 
> the given timeUomId and timeUomMultiple
> 2/ getTimeUomMultipleDifference (3 methods) gets the timeUomMultiple for two 
> Timestamp Date or Calendar objects given the timeUomId.

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