title: How could I find the earliest date a time as well as the most recent date and time in a data frame?
body: <p>I have a column in my data frame of values formatted as <code>datet time</code>: <code>2017-09-11 08:00:00</code> and so forth.</p>
  
  <p>I want to find the earliest date with the earliest time of that date as well as the last (most recent) date with the last time. </p>
  
  <p>I am basically trying to find the range of this column to determine the difference in time. </p>
  
  <p>Thanks!</p>