NSString 与 NSDate 互相转换

NSString 转换为 NSDate数据：

     NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSDate *date = [dateFormatter dateFromString:@"2012-04-01 12:00:00"];

    NSLog(@"%@", date);

    [dateFormatter release];

NSDate 转化为 NSString 数据：

    NSDateFormatter *dateFormatter = [[NSDateFormatteralloc] init];

    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

    NSString *strDate = [dateFormatter stringFromDate:[NSDate date]];

    NSLog(@"%@", strDate);

    [dateFormatter release];