using System;

public class Program

{

    public static void Main(string[]args)

    {

        int ch,a,b,d,e;

        Console.WriteLine("\n date manipulation");

        Console.WriteLine("\t *************** ");

        do

        {

            Console.WriteLine("\n current data and time");

            Console.WriteLine("\n day of the week");

            Console.WriteLine("\n leapyear");

            Console.WriteLine("\n add days");

            Console.WriteLine("\n to string");

            Console.WriteLine("\n day in a month");

            Console.WriteLine("\n exit");

            Console.WriteLine("enter the choice");

            switch(ch)

            {

                case 1:

                    Console.WriteLine("date and time" + ("date time.now"));

                        break;

                                      case 2:

                    Console.WriteLine("Days of the week" +("date time.now.day of week"));

                    break;

                case 3:

                    a =Console.ReadLine();

                    Console.WriteLine("/ Leap year" + ("date time is leap year(a))"));

                    break;

                case 4:

                    b = Console.ReadLine();

                    Console.WriteLine("add days" +date time.now.add day(b));

                    break;

                case 5:

                    Console.WriteLine("to string" +("date time.now.to string('f')"));

                                      break;

                case 6:

                    d =Console.ReadLine("year");

                    e =Console.ReadLine();

                    Console.WriteLine("days in the month" +("date time.days in month(d,c)"));

                    break;

                    while(ch <=7)

            }

        }

    }