NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);

    NSString *path = [[paths objectAtIndex:] stringByAppendingString:@"/hi.dat"];

    [[NSFileManager defaultManager] createFileAtPath:path contents:NULL attributes:NULL];

    NSURL *url = [[NSURL alloc] initFileURLWithPath:path];

    NSLog(@"URL is: %@", url);

    [url release];

    NSDate *date = [NSDate dateWithTimeIntervalSinceNow:0.0];

    // 打印日期：中间的空格可以用'at'或'T'等字符来分隔

    NSDateFormatter *dateFomatter = [[NSDateFormatter alloc] init];

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

    NSLog(@"Current date is: %@", [dateFomatter stringFromDate:date]);

    [dateFomatter release];