title: How to get day of a ruby Date Object
body: <p>Say I have created a Data object like this.</p>
  
  <pre><code>semester_start_date = Date.new(2013,1,15)
  </code></pre>
  
  <p>Now how I can find if <code>semester_start_date.day == 'Thursday'</code> or any other day for that matter?</p>
  
  <p>Thanks.</p>