Day/month/year order is shown incorrectly in date picker

Desciption

When using a date picker in a Confluence page in other languages the day, month and year order is shown incorrectly. Irrespective of the settings in the configuration or the JVM parameters they always default to mm-dd-yyy if the language is set to any other than US/UK.

Environment

Confluence 7.0.1

Steps to Reproduce

1. Change the profile language to a non US/UK language
2. Create a new Confluence page and add a date
3. The picker is shown with the incorrect order for the region/language

Expected Results

The day and month ordering is correct for the region e.g. dd-mm-yyyy

Actual Results

In other languages or regions other than US/UK this is shown as mm-dd-yyyy

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available