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If a JIRA user uses non-English locale then (s)he is not able to modify date fields of issues, see issue 178677. The fix of issue 178677 provides a command line switch to set the locale, but it would be nice to be able to set the locale in GUI.
FYI, see the Mylyn Connector FAQ relevant to this issue http://confluence.atlassian.com/display/IDEPLUGIN/Invalid+Date+Error+When+Submitting+a+JIRA+Issue
also issue #207341
applies to: org.netbeans.modules.jira.datePattern org.netbeans.modules.jira.dateTimePattern org.netbeans.modules.jira.locale