title: Display commiter date in gitk instead of author date
body: <p>I am using <strong>gitk</strong> to browse my git repo and i would like to print the commit date of commit instead of author date in <strong>gitk</strong> (on the third column).</p>
  
  <p>Can you tell me how to do it ?</p>
  
  <p><a href="https://i.stack.imgur.com/WoNME.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WoNME.png" alt="enter image description here"></a></p>