title: [NSDate descriptionWithLocale:[NSLocale systemLocale]] leak?
body: <p><img src="https://i.stack.imgur.com/134gO.png" alt="enter image description here">Using instruments I found a strange problem regarding memory leaks. My app has a log mechanism which record events through the app and the whole communication with the server(request-response). Each event object that is been wrote has a timestamp. This timestamp is get as follows:</p>
  
  <pre><code>[NSDate descriptionWithLocale:[NSLocale systemLocale]]
  </code></pre>
  
  <p>Using instruments, I saw that descriptionWithLocale cause leaks.</p>
  
  <p>Below is the code:</p>
  
  <pre><code>-(id)initEvent:(NSString*)eventStr details:(NSString*)detailsStr{
       eventString = [[NSMutableString alloc] initWithString:eventStr];
       detailsString = [[NSString alloc] initWithString:detailsStr];
       date =[[NSMutableString alloc] init];
       NSDate* currentDate = [NSDate date];    
       NSString *dateDescStr = [currentDate descriptionWithLocale:[NSLocale systemLocale]];
        [date appendString:dateDescStr];  
  
      return [super init];
  </code></pre>
  
  <p>Thanks,
  Alex.</p>