CheckDataFromEGN_1.1

using System;
using System.Collections.Generic;
using System.Linq;

namespace EGN
{
    class Program
    {
        private static long CalculateYears(long n)
        {
            //ПО месеца се разбира коя година (<1900||1900<=1999||>1999) е роден човека
            //+20
            //+40
            var month = 0;
            var temp = n;
            if (n<12)
            {
                for (int i = 1; i <= n; i++)
                {
                    if (i == temp)
                    {
                        month = i;
                        break;
                    }
                }
            }
            if (n>21 && n <= 32)
            {
                for (int i = 21; i <= n; i++)
                {
                    var minusTwenty = i - 20;

                    if (i == temp)
                    {
                        month = minusTwenty;
                        break;
                    }
                }
            }
            if (n>=41 && n<=52)
            {
                for (int i = 41; i <= n; i++)
                {
                    var minusFourty = i - 40;
                    if (i == temp)
                    {
                        month = minusFourty;
                        break;
                    }
                }
            }
            return month;

        }
        static void Main(string[] args)
        {
            long input = long.Parse(Console.ReadLine());

            long result = 0;
            long res = 0;
            long newTemp = input;
            long temporal = 0;
            long tre = input;
            for (int j = 0; j < 5; j++)
            {
                temporal = tre % 100;
                tre /= 100;
            }
            //0044285021
            if (temporal!=0)
            {
                List<long> egnn = new List<long>();
                List<long> controlNumber = new List<long>();
                while (newTemp > 0)
                {
                    res = newTemp % 10;
                    controlNumber.Add(res);
                    newTemp /= 10;
                }
                long[] cont = { 0, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
                long contrMulty = 0;
                for (int i = 1; i < controlNumber.Count; i++)
                {
                    contrMulty += (cont[i] * controlNumber[i]);
                }
                long controla = 0;
                if (contrMulty % 11 == 10)
                {
                    controla = 0;
                }
                else
                {
                    controla = contrMulty % 11;
                }

                Console.WriteLine("Контролно число: " + controla);
                Console.Write("Роден:");
                while (input > 0)
                {
                    result = input % 100;
                    egnn.Add(result);
                    input /= 100;
                }
                var checkForYear = egnn[3];
                //
                var year = CalculateYearsPeint(egnn);
                Console.WriteLine(year);
                Console.WriteLine($"Възраст/разлика м/у датите в години: {DateTime.Now.Year} => {DateTime.Now.Year - year}");
                //
                var month = CalculateYears(egnn[3]);
                Console.Write("Month: ");
                switch (month)
                {
                    case 1: Console.WriteLine("Jan"); break;
                    case 2: Console.WriteLine("Feb"); break;
                    case 3: Console.WriteLine("March"); break;
                    case 4: Console.WriteLine("April"); break;
                    case 5: Console.WriteLine("May"); break;
                    case 6: Console.WriteLine("June"); break;
                    case 7: Console.WriteLine("July"); break;
                    case 8: Console.WriteLine("August"); break;
                    case 9: Console.WriteLine("Sept"); break;
                    case 10: Console.WriteLine("Oct"); break;
                    case 11: Console.WriteLine("Novem"); break;
                    case 12: Console.WriteLine("Dec"); break;
                }
                if (egnn[2] > 0 && egnn[2] < 32)
                {
                    var sufix = "Ден: ";

                    Console.WriteLine(sufix + egnn[2]);
                }
                var sexcontrol = egnn[0] / 10;
                if (sexcontrol % 2 == 0)
                {
                    Console.WriteLine("Пол: Мъж");
                }
                else
                {
                    Console.WriteLine("Пол: Жена");
                }
            }
            else
            {
                List<long> egnn = new List<long>();
                List<long> controlNumber = new List<long>();
                while (newTemp > 0)
                {
                    res = newTemp % 10;
                    controlNumber.Add(res);
                    newTemp /= 10;
                }
                long[] cont = { 0, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
                long contrMulty = 0;
                for (int i = 1; i < controlNumber.Count; i++)
                {
                    contrMulty += (cont[i] * controlNumber[i]);
                }
                long controla = 0;
                if (contrMulty % 11 == 10)
                {
                    controla = 0;
                }
                else
                {
                    controla = contrMulty % 11;
                }

                Console.WriteLine("Контролно число: " + controla);
                Console.Write("Роден:");
                while (input > 2)
                {
                    result = input % 100;
                    egnn.Add(result);
                    input /= 100;
                }
               var year = TryCalcYear(egnn);
                Console.WriteLine(year);

                Console.WriteLine($"Възраст/разлика м/у датите в години: {DateTime.Now.Year} => {DateTime.Now.Year - year}");
                var month = CalculateYears(egnn[3]);
                Console.Write("Month: ");
                switch (month)
                {
                    case 1: Console.WriteLine("Jan"); break;
                    case 2: Console.WriteLine("Feb"); break;
                    case 3: Console.WriteLine("March"); break;
                    case 4: Console.WriteLine("April"); break;
                    case 5: Console.WriteLine("May"); break;
                    case 6: Console.WriteLine("June"); break;
                    case 7: Console.WriteLine("July"); break;
                    case 8: Console.WriteLine("August"); break;
                    case 9: Console.WriteLine("Sept"); break;
                    case 10: Console.WriteLine("Oct"); break;
                    case 11: Console.WriteLine("Novem"); break;
                    case 12: Console.WriteLine("Dec"); break;
                }
                if (egnn[2] > 0 && egnn[2] < 32)
                {
                    var sufix = "Ден: ";

                    Console.WriteLine(sufix + egnn[2]);
                }
                var sexcontrol = egnn[0] / 10;
                if (sexcontrol % 2 == 0)
                {
                    Console.WriteLine("Пол: Мъж");
                }
                else
                {
                    Console.WriteLine("Пол: Жена");
                }
            }
            Console.WriteLine(DateTime.Now.Year);
        }

        private static int TryCalcYear(List<long> egnn)
        {
            var checkForYear = egnn[3];
            var years = 0;
            if (checkForYear > 21 && checkForYear <= 32)
            {
                years += 1800;
               // Console.WriteLine(years);
            }
            else if (checkForYear >= 41 && checkForYear <= 52)
            {
                years += 2000;
               // Console.WriteLine(years);
            }
            else
            {
                years += 1900;
                //Console.WriteLine(years);
            }
            return years;
        }

        private static long CalculateYearsPeint(List<long> egnn)
        {
            var checkForYear = egnn[3];
            if (checkForYear > 21 && checkForYear <= 32)
            {
                egnn[4] += 1800;
               // Console.WriteLine(egnn[4]);
            }
            else if (checkForYear >= 41 && checkForYear <= 52)
            {
                egnn[4] += 2000;
                //Console.WriteLine(egnn[4]);
            }
            else
            {
                egnn[4] += 1900;
                //Console.WriteLine(egnn[4]);
            }
            return egnn[4];
        }
    }
}