iOS NSDateFormatter Fail

NSString *pubDate = @"Tue, 30 Sep 2008 19:45:23 -0400";
	
	//remove the time, returns: Tue, 30 Sep 2008
	NSString *subStringPubDate = [pubDate substringWithRange:NSMakeRange(0, 16)];
	
	//create formatter and format
	NSDateFormatter *dtsFormatter = [[[NSDateFormatter alloc] init]  autorelease];
	[dtsFormatter setDateFormat:@"EEE, d MMM yyyy"];
	
	//run the string through the formatter
	NSDate *formattedDate = [dtsFormatter dateFromString:subStringPubDate];
	NSLog(@"%@", formattedDate);