psycopg2.DataError

When I run 'python manage.py validate' the following error is returned:

psycopg2.DataError: invalid value for parameter "TimeZone": "UTC"

settings.py

TIME_ZONE = 'America/Denver'

USE_TZ = True

I'm using Django 1.4.2 with Postgres 9.1/PostGIS on OSX.

To test, I went back and commented out my custom apps in INSTALLED_APPS, but the error is still there. If I set USE_TZ to False, then the error becomes:

psycopg2.DataError: invalid value for parameter "TimeZone": "America/Denver"

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