title: What's the difference between 'Day' and 'Weekday' in launchd StartCalendarInterval?
body: <p>I'm working with launchd to run some automated tasks, and I was wondering what the difference is between 'Day' and 'Weekday'.</p>
  
  <p>According to <a href="http://discussions.apple.com/thread.jspa?threadID=1361809" rel="noreferrer">http://discussions.apple.com/thread.jspa?threadID=1361809</a> there is a  'subtle' difference that can cause launchd to misbehave.</p>
  
  <p>Ultimately, I'd like to have a plist that runs every weekday (Mon - Fri) at 8am, but I don't know how to get the cron equivalent of </p>
  
  <pre><code>0 8 * * 1-5
  </code></pre>