NSDate to NSString 형변환

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];
NSString *strDate = [formatter stringFromDate:[NSDate date]];
NSLog(@"%@", strDate);
 
 
NSString *strDate = @"2011-12-04";
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[strDate setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [[NSDate alloc] init];
date = [date dateFromString:date];
NSLog(@"%@", [date description]);