title: NSDateFormatter and setDateFormat: and SSS
body: <p>Using NSDateFormatter, here is my input : </p>
  
  <pre><code>00:20:11,026 (NSString)
  </code></pre>
  
  <p>And here is the output i want : </p>
  
  <pre><code>"00:20:11,026"; (NSDate)
  </code></pre>
  
  <p>but what I obtained is  : </p>
  
  <pre><code>"1970-01-01 00:20:11 +0100" (NSDate) 
  // SSS is missing and there is too much information... 
  </code></pre>
  
  <p>Here is what i coded :</p>
  
  <pre><code>...
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateFormat:@"hh:mm:ss,SSS"];
  [dateFormatter dateFromString:@"00:20:11,026"];
  ...
  </code></pre>