title: How to convert time into specific format in python?
body: <p>I have a column of time in my pandas DataFrame containing more than 800,000 rows. The time format is something like this:</p>
  <pre><code>08:28:31
  08:28:35
  08:28:44
  08:28:44
  </code></pre>
  <p>I want to convert this format into hourly, which means if the first time comes 08:28:31 then the second-time time should come in hour by hour 09:28:31 etc. How do we achieve this in python using the DateTime library</p>
  <p>output data:</p>
  <pre><code>08:28:31
  09:28:31
  ...
  23:28:31
  
  08:28:35
  09:28:35
  ...
  23:28:35
  
  08:28:44
  ...
  08:28:44
  ...
  </code></pre>