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Bug
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    Resolution: Done
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P2: Important
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    None
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    None
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    None
 
JIRA is broken. See:
http://jira.atlassian.com/browse/JRA-19946
http://jira.atlassian.com/browse/JRA-10088
Workaround is here:
http://jira.atlassian.com/browse/JRA-9048?focusedCommentId=183463&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_183463
in Jira 3.13.x the workaround for the ISO 8601 first week of year is similar to the monday workaround. In the same files:
atlassian-jira/WEB-INF/classes/templates/plugins/jira/macros.vm
template/standard/datepicker2.jsp
template/single/datepicker2.jsp
after the line in the calendar setup where you correct the "firstDay : 0," to "firstDay : 1," add the following line:
useISO8601WeekNumbers : true, // first week of the year
Please consider the risks of this applying this fix and advise if it is go/no go.
I expect there will be need to send notification of such a change before it is applied.