PSO UI Date Need US Format

We have two PSO environments, one for testing and one for production. 

Our test environment has the correct US date format of month/day/year but our production environment is displaying day/month/year. We’re not sure why the production environment is incorrect or how to fix it. It doesn’t look like any parameter or permission to set for the format we need to use?

PRODUCTION (incorrect): 

TESTING (correct):

We are using the same web browser to display both environments. Thanks for guidance on how to solve this!