title: Copying an NSDate (wanting independent objects)
body: <p>NSDate conforms to NSCopying protocol.  According to the documentation for NSCopying protocol:</p>
  
  <pre><code>a copy must be a functionally independent object with values identical
  to the original at the time the copy was made.
  </code></pre>
  
  <p>But, when I do this:</p>
  
  <pre><code>NSDate *date1 = [NSDate date];
  NSDate *date2 = [date1 copy];
  NSLog(@"result: date1 0x%x  date2 0x%x", (int)date1, (int)date2);
  // "result: date1 0x2facb0  date2 0x2facb0"
  </code></pre>
  
  <p>The two objects are identical (same object id).  What am I missing?  How do I get an independent object as a copy?</p>