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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            DateTime dt = Convert.ToDateTime("2017-10-24 18:34:23");
            string time = "2017-10-10 20:34:23"; //dt.Subtract(time) dt.Days=13
            Console.WriteLine(dt.Subtract(Convert.ToDateTime(time)).Days);
            DateTime Time = Convert.ToDateTime(time).Date;
            TimeSpan ts = dt.Date.Subtract(Time); //dt.Subtract(time) dt.Days=14
            int day = ts.Days;
            //Console.WriteLine("{0},{1}", dt, time);
            Console.WriteLine(day);
            Console.Read();
        }
    }
}