title: How to convert zulu datetime format to user defined time format
body: <p>Hi I have this DateTime format in our log "2019-09-19T15:12:59.943Z"
  I want to convert this to custom DateTime format 2019-09-19 15:12:59</p>
  
  <pre><code>from datetime import datetime
  timestamp = "2019-09-19T15:12:59.943Z"
  dt_object = datetime.fromtimestamp(timestamp)
  print("dt_object =", dt_object)
  print("type(dt_object) =", type(dt_object))
  </code></pre>
  
  <p>which function shall I use for this
  thanks</p>