title: How to convert string column to time column type?
body: <p>I have a column in this format</p>
  <p><a href="https://i.stack.imgur.com/Y6uAh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Y6uAh.png" alt="Original format" /></a></p>
  <p>when I ingest the data, it is in a string format.
  When I tried to convert it to timespan, the values disappear
  <a href="https://i.stack.imgur.com/g2Bhl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/g2Bhl.png" alt="After converting to timespan data type" /></a></p>
  <p>How can I convert string column to timespan?</p>