title: Python plot with 24 hrs x and y axis using only hours and minutes from timestamp
body: <p>I'm looking to create a plot with 24 hours in both the x and y axis, and make a scatterplot of start and end times. I have a CSV with the id and timestamps (including year, month, day and time) of the events, but need only where in the day it starts and ends regardless of the date.
  This is an example of the data.</p>
  <pre><code>ID        Start date        End date
  431032   8/29/2014 15:33    8/29/2014 16:00
  383548   7/28/2014 17:35    7/28/2014 17:45
  257887   4/22/2014 19:19    4/22/2014 19:28
  </code></pre>
  <p>In other words, I need to make 'coordinates' out of hours and minutes to compare cluster data. I've never used time in both axes and haven't found an example of it. I'd really appreciate if someone that has already done this could share some tips.</p>