title: Add Days to predefined date
body: <p>I'm looking for a way to add days to a predefined date in the format MM/DD/YYYY. </p>
  
  <p>Basically I am trying to automate a process that looks at a predefined date and adds 30 days to it and then runs a series of commands.  All the searching around I've done has examples that use the current date, but none for predefined dates.</p>