The following charts are only displaying date data with resolution to year only (as if date was truncated to "yyyy" format only, see https://issues.jboss.org/secure/attachment/12409863/taskDatesIssue.png)

• Processes By Start Date
• Processes By End Date
• Tasks By Creation Date
• Tasks By End Date

In 6.5 the charts were using format "dd MMM" which was also not ideal, but at least with day precision. In my opinion the correct format to be used should include all: year, month and day for date data to be displayed correctly.