title: Convert unix epoch time to human readable date on Mac OSX - BSD
body: <p>On my Mac OSX, my bash script has a epoch time <code>123439819723</code>. I am able to convert the date to human readable format by <code>date -r 123439819723</code> which gives me <code>Fri Aug 26 09:48:43 EST 5881</code>.  </p>
  
  <p>But I want the date to be in <code>mm/ddd/yyyy:hh:mi:ss</code> format.  The <code>date --date</code> option doesn't work on my machine. </p>