title: django settings default time zone
body: <p>here is a question i can use django time zone for utc and it worked fine
  but when i switch the default time zone to 'Asia/Tehran' it wont work and i get the error</p>
  <pre><code>ValueError: Incorrect timezone setting: ASIA/TEHRAN
  </code></pre>
  <p>the actual code in settings.py is:</p>
  <pre><code>LANGUAGE_CODE = 'en-us'
  
  TIME_ZONE = 'Asia/Tehran'
  
  USE_I18N = True
  
  USE_L10N = True
  
  USE_TZ = True
  </code></pre>
  <p>and it is on django time zone list i checked it</p>
  <p>the system is ubuntu 20 and django version is 3.2</p>