Exam 5. Magic Dates

namespace _4.MagicDates
{
    using System;

    public class FindMagicDates
    {
        public static void Main(string[] args)
        {
            checked
            {
                int startYear = int.Parse(Console.ReadLine());
                int endYear = int.Parse(Console.ReadLine());
                int magicWeight = int.Parse(Console.ReadLine());

                DateTime startDate = new DateTime(startYear, 01, 01);
                DateTime endDate = new DateTime(endYear, 12, 31);
                bool foundMagicDates = false;
                for (DateTime date = startDate; date <= endDate; date = date.AddDays(1))
                {
                    int dateDig1 = date.Day / 10;
                    int dateDig2 = date.Day % 10;
                    int dateDig3 = date.Month / 10;
                    int dateDig4 = date.Month % 10;
                    int dateDig5 = date.Year / 1000;
                    int dateDig6 = (date.Year / 100) % 10;
                    int dateDig7 = (date.Year / 10) % 10;
                    int dateDig8 = date.Year % 10;
                    int[] dateNums = new int[8] { dateDig1, dateDig2, dateDig3, dateDig4, dateDig5, dateDig6, dateDig7, dateDig8 };

                    int dateSum = 0;
                    for (int i = 0; i + 1 < dateNums.Length; i++)
                    {
                        for (int j = i + 1; j < dateNums.Length; j++)
                        {
                            dateSum += dateNums[i] * dateNums[j];
                        }
                    }

                    if (dateSum == magicWeight)
                    {
                        foundMagicDates = true;
                        Console.WriteLine("{0:d2}-{1:d2}-{2:d2}", date.Day, date.Month, date.Year);
                    }
                }

                if (!foundMagicDates)
                {
                    Console.WriteLine("No");
                }
            }
        }
    }
}