任意输入一个日期输出是当年的第几天星期几

class Program
{
     static void Main(string[] args)
      {
            string putDateStr = Console.ReadLine();
            DateTime putDate = new DateTime(Int32.Parse(putDateStr.Split(' ')[0]), Int32.Parse(putDateStr.Split(' ')[1]), Int32.Parse(putDateStr.Split(' ')[2]));
            DateTime offsetDate = putDate;
            DateTime initDate = new DateTime(putDate.Year, 01, 01);
            int dayOffset = 0;
            int weekOffset = (int)putDate.DayOfWeek;
            while (offsetDate >= initDate)
            {
                dayOffset++;
                if (dayOffset > 1)
                {
                    weekOffset--;
                    if (weekOffset == -1)
                    {
                        weekOffset = 6;
                    }
                }
                offsetDate = offsetDate.AddDays(-1);
            }
            Console.WriteLine($"该日期是当年的第{dayOffset}天星期{(int)putDate.DayOfWeek}，当年的第一天是星期{weekOffset}");
            Console.ReadKey();
      }       
}