title: How to parse a date without a year in Ruby
body: <p>I'm trying to parse a date in ruby on rails so I can get the month and day out of it.</p>
  
  <pre><code> DateTime.parse("07/09") // Works
   DateTime.parse("02/07/1975") // Works
   DateTime.parse("08/26/1983") // Fails 
   DateTime.parse("04/28/1982") // Fails
   DateTime.parse("10/17/1961") // Fails
  </code></pre>
  
  <p>Why would that one fail?  There are several others that fail too, with no common thread that I can see.</p>