title: How to get the current time as datetime
body: <p>Just started with the playground. I'm trying to create a simple app.</p>
  
  <p>I've created a date object like this:</p>
  
  <pre><code>var date = NSDate()
  </code></pre>
  
  <p>How can I get the current hour? In other languages I can do something like this:</p>
  
  <pre><code>var hour = date.hour
  </code></pre>
  
  <p>But I can't find any properties/methods like that. I've found a method, <code>dateWithCalendarFormat</code>. Should I use that? If so, HOW?</p>