改变（设置）文件的创建、修改、访问时间

FileInfo fi = new FileInfo("C:\\test.txt");
Console.WriteLine(fi.CreationTime.ToString());
Console.WriteLine(fi.LastWriteTime.ToString());
Console.WriteLine(fi.LastAccessTime.ToString());

// 改变（设置）文件的创建、修改、访问时间
File.SetCreationTime("C:\\test.txt", DateTime.Now.AddYears(-1));
File.SetLastWriteTime("C:\\test.txt", DateTime.Now.AddYears(-2));
File.SetLastAccessTime("C:\\test.txt", DateTime.Now.AddYears(-3));