title: time data '2018-06-19 11:21:13.311' does not match format
body: <p>Using python, I am trying to read a date/time format ergo 2018-06-19 11:21:13.311, which returns an error: </p>
  
  <pre><code>ValueError: time data '2018-06-19 11:21:13.311' does not match format
  '%Y-%m-%d %I:%M:%S.%%'
  </code></pre>
  
  <p>I have tried removing the .%%, but the program returns an unconverted data error message. Does anyone know what the .311 is? And how I can read it?</p>