DateTime getting the duration from each element within two lists(start time/end time)

Try this

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
           List<string> list1 = new List<string> {
               "Feb 12 01:23:57", 
               "Feb 12 01:25:50", 
               "Feb 12 01:28:57"
           };
           List<string> list2 = new List<string> {
               "Feb 12 02:23:57",
               "Feb 12 03:25:50",
               "Feb 12 04:28:57",
               "Feb 12 08:45:50"
           };
           CultureInfo provider = CultureInfo.InvariantCulture;
           List<DateTime> tlist1 = list1.Select(x => DateTime.ParseExact(x, "MMM dd hh:mm:ss", provider)).ToList();
           List<DateTime> tlist2 = list2.Select(x => DateTime.ParseExact(x, "MMM dd hh:mm:ss", provider)).ToList();
           List<TimeSpan> results = null;
           if (tlist1.Count <= tlist2.Count)
               results = tlist1.Select((x, index) => tlist2[index].Subtract(x)).ToList();
           else
               results = tlist2.Select((x, index) => x.Subtract(tlist1[index])).ToList();
        }
    }
}

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jdweng