question related to conversion from NSDate to NSString

NSString *abc = @"2009-12-12 16:25:00";

i have 1 string in this format as shown above.

NSDate *currentDate = [NSDate date]; now i want currentDate in also this format as specified 2009-1开发者_运维问答2-12 16:25:00

and also i want to convert this currentDate from NSdate to NSString format with specified thisformat 2009-12-12 16:25:00

help me

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    NSDateFormatter* dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString* golly = [dateFormatter stringFromDate:[NSDate date]];

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Use NSDateFormatter.