Sets the last modified date time to file

gistfile1.cs

  	private static readonly DateTime Jan1st1970 = new DateTime
			(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
		
		public static long CurrentTimeMillis()
		{
			return (long) (DateTime.UtcNow - Jan1st1970).TotalMilliseconds;
		}
		
		public static DateTime GetDateFromMilliSeconds(long milliseconds)
		{
			return Jan1st1970.AddMilliseconds(milliseconds);
		}

		static void WriteLastAccessedTime ()
		{
			string documentsPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
			string path = System.IO.Path.Combine (documentsPath, "text.txt");
			File file = new File (path);
			if (!file.Exists ()) {
				file.CreateNewFile ();
			}
			try {
				using (var buffer = new BufferedWriter (new FileWriter (file, true))) {
					buffer.Append ("Hello");
					buffer.Close ();
				}
				System.Console.WriteLine (file.LastModified ());
				var time = CurrentTimeMillis ();
				file.SetLastModified (time);
				System.Console.WriteLine (GetDateFromMilliSeconds(file.LastModified()));
			}
			catch (System.Exception ex) {
				System.Console.WriteLine (ex.ToString ());
			}
		}