BirthDayAfterTenYears

using System;
using System.Linq;

namespace BirthDayAfterTenYears
{
    class HowOldIsUser
    {
        static void Main()
        {
            Console.WriteLine("Enter you birthday: DD.MM.YYYY");
            string birthDay = Console.ReadLine();
            string userYear = birthDay.Substring(6, 4);
            int userYearInt = int.Parse(userYear);
            string userMonth = birthDay.Substring(3, 2);
            int userMonthInt = int.Parse(userMonth);
            string userDay = birthDay.Substring(0, 2);
            int userDayInt = int.Parse(userDay);

            try
            {
                switch (userMonthInt)
                {
                    case 01:
                        {
                            string userMonthStr = "January";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 02:
                        {
                            string userMonthStr = "February";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 03:
                        {
                            string userMonthStr = "March";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 04:
                        {
                            string userMonthStr = "April";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 05:
                        {
                            string userMonthStr = "May";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 06:
                        {
                            string userMonthStr = "June";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 07:
                        {
                            string userMonthStr = "July";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 08:
                        {
                            string userMonthStr = "August";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 09:
                        {
                            string userMonthStr = "September";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 10:
                        {
                            string userMonthStr = "October";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 11:
                        {
                            string userMonthStr = "November";
                            userMonth = userMonthStr;
                            break;
                        }
                    case 12:
                        {
                            string userMonthStr = "December";
                            userMonth = userMonthStr;
                            break;
                        }
                    default:
                        {
                            Console.WriteLine("Wrong input.");
                            break;
                        }
                }
            }
            catch(Exception e)
            {
                throw e;
            }

            Console.WriteLine("User birthday:\nYear: {0}\nMonth: {1}\nDay: {2}", userYear, userMonth, userDay);

            int currentYearInt = DateTime.Now.Year;
            Console.WriteLine("Current year is: {0}", currentYearInt);
            int currentMonthInt = DateTime.Now.Month;
            Console.WriteLine("Current month is: {0}", currentMonthInt);
            int currentDayInt = DateTime.Now.Day;
            Console.WriteLine("Current day is: {0}", currentDayInt);

            //I think I could use these but I don't know how
            //DateTime userBirthDay = new DateTime(userYearInt, userMonthInt, userDayInt);
            //DateTime currentTime = new DateTime(currentYearInt, currentMonthInt, currentDayInt);

            int userAge = 0;
            userAge = currentYearInt - userYearInt;
            Console.WriteLine("User age is: {0}", userAge);

            int ageAfterTenYears = 0;
            ageAfterTenYears = userAge + 10;
            Console.WriteLine("After ten years user will be {0} years old.", ageAfterTenYears);
        }
    }
}