When I Use Persian Calendar I Get Error: "Additional information: String was not recognized as a valid DateTime" : I use Persian Date (Iranian Date Format or Jalali Calendar) in my program.

and when i use this:

    string A = "1396/2/30";
    string Test = String.Format("{0:yyyy/MM/dd}", Convert.ToDateTime(A));


i get the following error:

    An exception of type 'System.FormatException' occurred in mscorlib.dll but was not handled in user code
    Additional information: String was not recognized as a valid DateTime.