Week number is off by one in "Date Picker"

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.