using System;
using System.Globalization;

namespace Enum
{
    class Program
    {
        static void Main(string[] args)
        {
            string timestr = "1/20/2014 12:05:16 AM";
            var date = DateTime.ParseExact(timestr, "M/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
            Console.WriteLine(date);
        }
    }
}