using System;

using System.IO;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

    DateTime localDateTime, univDateTime;

        Console.WriteLine("Enter a date and time.");

        string strDateTime = Console.ReadLine();

​

        try {

            localDateTime = DateTime.Parse(strDateTime);

            univDateTime = localDateTime.ToUniversalTime();

            Console.WriteLine("{0} local time is {1} universal time.",

                                localDateTime,

                                    univDateTime); 

        }

        catch (FormatException) {

            Console.WriteLine("Invalid format.");

            return;

        }

​

        Console.WriteLine("Enter a date and time in universal time.");

        strDateTime = Console.ReadLine();

​

        try {

            univDateTime = DateTime.Parse(strDateTime);

            localDateTime = univDateTime.ToLocalTime();

            Console.WriteLine("{0} universal time is {1} local time.",

                                     univDateTime,

                                     localDateTime); 

        }

        catch (FormatException) {

            Console.WriteLine("Invalid format.");

            return;

        }

​

    }

    }

​