title: how to get UTC offset value from timezone?
body: <p>In my Django project, I have a form <strong><em>(forms.py)</em></strong> which implements pytz to get current timezone like this:</p>
  
  <pre><code>tz = timezone.get_current_timezone()
  </code></pre>
  
  <p>and I have passed this value to a form field as an initial value like this:</p>
  
  <pre><code>timezone = forms.CharField(label='Time Zone', initial=tznow)
  </code></pre>
  
  <p>which gives the field a default value of current Timezone, in my case, it happens to be <strong>Asia/Calcutta</strong>.</p>
  
  <p>Now i want to find the UTC Offset value for the given Timezone, which in this case <strong>Asia/Calcutta</strong> is <strong>+5:30</strong></p>
  
  <p>I tried tzinfo() method as well, but i couldn't find the expected result. Can somebody guide me through this?</p>