using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<DateTime> dateTimeList = new List<DateTime>();

        DateTime dateNow = DateTime.Now;

        // use dateNow.Ticks in the constructor to create a precise, synchronized DateTime

        DateTime date = new DateTime(dateNow.Ticks);

        date = date.AddMinutes(-10);

        while (date < dateNow.AddMinutes(10))

        {

            dateTimeList.Add(date);

            date = date.AddMinutes(1);

        }

​

        if (dateTimeList.Any(x => x == dateNow))

            Console.WriteLine("date found");

        else

            Console.WriteLine("date Not found");

        var format = "ddMMyyyy hh:mm:ss:fffz";

        if (dateTimeList.Any(x => x.ToString(format) == dateNow.ToString(format)))

            Console.WriteLine("date string matched");

        else

            Console.WriteLine("date string didn't match");

    }

}