val = "18/07/2007 22:16:30";


   string[] UKformats = {"d/M/yyyy h:mm:ss tt", "d/M/yyyy h:mm tt",
   "dd/MM/yyyy hh:mm:ss", "d/M/yyyy h:mm:ss",
   "d/M/yyyy hh:mm tt", "d/M/yyyy hh tt",
    "d/M/yyyy h:mm", "d/M/yyyy h:mm",
    "dd/MM/yyyy hh:mm", "dd/M/yyyy hh:mm"};


     //UK
     try
     {
        MyDateTime = DateTime.ParseExact(val, UKformats, new CultureInfo("en-GB"), DateTimeStyles.None);
      }
       catch (Exception ex) { Console.WriteLine("date conversion error for " + val); }