using System;

public class Program

{

    public static void Main()

    {

        DateTime dateValueFromDateTime;

        DateTime dateValueToDate;

        DateTime.TryParse("2020-02-15 18:00:00", out dateValueFromDateTime);

        DateTime.TryParse("2020-02-18", out dateValueToDate);

        Console.WriteLine(dateValueFromDateTime);

        Console.WriteLine(dateValueFromDateTime.Date);

        Console.WriteLine(dateValueToDate.Date);

        Console.WriteLine((dateValueFromDateTime - dateValueToDate.Date).Days);

        Console.WriteLine((dateValueFromDateTime.Date - dateValueToDate.Date).Days);

    }

}