title: What is the recommended way of doing date arithmetics in Perl?
body: <p>What is the recommended way of doing date arithmetics in Perl?</p>
  
  <p>Say for example that I want to know the date three days ago from today (where <code>today</code> = <code>2010-10-17</code> and <code>today - 3 days</code> = <code>2010-10-13</code>). How would you do that in Perl?</p>