static void runTimeConverter()
 {
  double arrivalTime;
  arrivalTime = getArrivalTime();
  string time = DateTime.ParseExact(arrivalTime, "HHmm", CultureInfo.CurrentCulture)
   .ToString("hh:mm tt");
  Console.WriteLine("Equals " + time);
 }

static double getArrivalTime()

   {
    Console.WriteLine
        ("Enter time in 24 hour format to convert to 12hour");
    string timeSelected = Console.ReadLine();
    int timeInput = int.Parse(timeSelected);
    return timeInput;
}

using System.Globalization;