using System;

using System.Collections.Generic;

using System.Linq;

​

​

   public class Program

    {

        public static void Main(string[] args)

        {

            var words = new List<string> { "sky", "rock", "forest", "new", "falcon", "jewelry" };

            var sarnew = new List<string> {"6/19/1979 8:00:00 AM" ,"5/5/1980 7:00:00 PM","10/20/1982 5:00:00 PM","1/4/1984 6:00:00 AM"};

            var logList = new List<long> {132309192621480091,132309204621530092,132309204823128475,132309205181049775,132309205181059781,132309206306016204,132309206306026210}; 

            var timeList1 = new List<DateTime>();

            DateTime time1 = System.DateTime.FromFileTime(132309192621480091);

            DateTime time2 = System.DateTime.FromFileTime(132309204823128475);

            var timeList = new List<DateTime>();

            foreach (var date in sarnew){

                timeList.Add( Convert.ToDateTime(date));

            }

            var filtered = new List<string>();

​

            foreach (var item in logList)

            {

                timeList1.Add(System.DateTime.FromFileTime(item));

            }

            //var filtered2 = words.Where(pv => words.IndexOf(pv)<3);

            var filtered2 = words.Where(pv => pv.Contains("fal")).Where(pv => pv.Contains("con"));

            var filtered3 = timeList.OrderByDescending(x => x.TimeOfDay).Take(2);

            var filteredTime = timeList1.Where(pv => pv>time1).Where(pv=>pv<time2);

            Console.WriteLine(string.Join(",", filtered));

            Console.WriteLine(string.Join(",", filtered2));

            Console.WriteLine(string.Join(",", filtered3));

            Console.WriteLine(string.Join(",", filteredTime));

        }

    }

​