public static void Main() { List <DateTime> datas = new List <DateTime>(); for (int i = 0; i < 2; i++) { string[] dataInput = Console.ReadLine() .Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries) .ToArray(); int year = int.Parse(dataInput[0]); int month = int.Parse(dataInput[1]); int day = int.Parse(dataInput[2]); DateTime data = new DateTime(year, month, day); datas.Add(data); } DateModifier dateModifier = new DateModifier(); long result = dateModifier.CalculateDifferenceBetweenTwoDatas(datas); Console.WriteLine(result); }