title: How to create tzinfo when I have UTC offset?
body: <p>I have one timezone's offset from UTC in seconds (<code>19800</code>) and also have it in string format  - <code>+0530</code>.</p>
  
  <p>How do I use them to create a <code>tzinfo</code> instance? I looked into <code>pytz</code>, but there I could only find APIs that take timezone name as input.</p>