Broken DateFormat in Reports DatePicker fields.

Issue Summary

When a dateformat is configured in JIRA for the datepicker field, JIRA fails to abide by this date ruling for datepicker fields found in report pages.

Environment

• Jira 7.2
• Using Timesheet Reports and Gadgets.

Steps To Reproduce

1. Go to Admin > System > General Configuration page.
2. Click on Advanced Settings
3. Modify the Java date picker to the format dd.mm.YYYY
4. Modify the JavaScript date picker to the format %d.%m.%Y
5. Go to Look & Feel page.
6. Modify the date picker to: dd/MM/yy
7. Install the plugin Timesheet Report and Gadget for JIRA.
8. Go any project > Report > Timesheet Report page.
9. Attempt to use the date picker fields.

Expected Result

• JIRA would show the correct date format where 1/10/2016 = 1st October 2016.

Actual Result

• JIRA would show the incorrect date format where 1/10/2016 = 10th January 2016.

Note

The issue disappears once the day goes past a corresponding month.

Workaround

• This has been fixed on the add-on side. Upgrading to version 3.2 of Timesheet Reports and Gadgets or newer will fix the behavior reported here.