In the Bright Analytics report engine you can control the way your dates are formatted.

For example:

2017-06-10
10th June 2017
Sat 10th June 2017

etc

To change this you need to head to the 'Date' dimension in the report builder UI.

You need to change 2 settings:

The SQL field. This accepts MySQL date formatting arguments
The Date Format field. This accepts PHP date formatting arguments.

The resulting output of the 2 fields need to be identical.

Contact us if you run into any trouble with this or have any questions.