title: Seconds since midnight to time of day
body: <p>There is a post that shows how use <code>lubridate</code> to go from time to seconds since midnight.  How about going from seconds since midnight to time of day?</p>
  
  <p>So, instead of using 06:52:32 to get 24752.05, how do I use 24752.05 to get 06:52:32?</p>