[iOS Dev] NSDate, NSString conversion and get TimeZone

	// Get TimeZone
	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	[dateFormatter setDateFormat:@"Z"];
	NSString *tz = [dateFormatter stringFromDate:[NSDate date]];
	[dateFormatter release];
	// Convert NSDate to NSString
	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
	NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];
	[dateFormatter release];
	// Convert NSString to NSDate
	NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
	NSDate *date = [dateFormatter dateFromString:@"2011-03-09 15:06:33"];
	[dateFormatter release];

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