1.CalculateYourAgeNow_AndAfter10Years

/* Write a program to read your birthday from the console and print
 * how old you are now and how old you will be after 10 years. */

namespace _15.AgeAfter10Years
{
    using System;
    using System.Globalization;
    using System.Threading;

    public class PrintYourAgeNowAndAfter10Years
    {
        public static void Main(string[] args)
        {
            Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
            checked
            {
                Console.WriteLine("Your Birthday must writing exactly in that format: dd.MM.yyyy !");
                Console.WriteLine("For Example: '25.03.1995'");
                Console.Write("Enter your BIRTHDAY: ");
                string inputStr = Console.ReadLine();
                string dateFormatStr = "dd.MM.yyyy";
                DateTime yourBirthday = DateTime.ParseExact(inputStr, dateFormatStr, CultureInfo.InvariantCulture);
                DateTime today = DateTime.Today;

                // Calculate difference between these 2 dates in Days and convert them in Years!
                int differenceInDays = (int)(today - yourBirthday).TotalDays;
                int daysForLeapYears = (differenceInDays / 365) / 4;
                int age = (differenceInDays - daysForLeapYears) / 365;

                Console.WriteLine("Now, you are {0} years old!", age);
                int ageAfter10Years = age + 10;
                Console.WriteLine("After 10 Years, you will be {0} years old!", ageAfter10Years);
            }
        }
    }
}