old_contents: import os
  
  INSTALLED_APPS = (
      'model_utils',
      'tests',
  )
  DATABASES = {
      "default": {
          "ENGINE": "django.db.backends.postgresql_psycopg2",
          "NAME": os.environ.get("DB_NAME", "modelutils"),
          "USER": os.environ.get("DB_USER", 'postgres'),
          "PASSWORD": os.environ.get("DB_PASSWORD", ""),
          "HOST": os.environ.get("DB_HOST", "localhost"),
          "PORT": os.environ.get("DB_PORT", 5432)
      },
  }
  SECRET_KEY = 'dummy'
  
  CACHES = {
      'default': {
          'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
      }
  }
  
  DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
  
new_contents: import os
  
  INSTALLED_APPS = (
      'model_utils',
      'tests',
  )
  DATABASES = {
      "default": {
          "ENGINE": "django.db.backends.postgresql_psycopg2",
          "NAME": os.environ.get("DB_NAME", "modelutils"),
          "USER": os.environ.get("DB_USER", 'postgres'),
          "PASSWORD": os.environ.get("DB_PASSWORD", ""),
          "HOST": os.environ.get("DB_HOST", "localhost"),
          "PORT": os.environ.get("DB_PORT", 5432)
      },
  }
  SECRET_KEY = 'dummy'
  
  CACHES = {
      'default': {
          'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
      }
  }
  
  DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'
  
  USE_TZ = False
  
subject: Add USE_TZ setting.