NSDateとNSStringの変換

NSStringからNSDateへ

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

NSDateからNSStringへ

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