MaskBinary.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        private const int MB = 1024*1024;
        
        public static void Main(string[] args)
        {
            long mask = 0L;
            for(var i=0; i<32; i++) mask = (mask << 1) | 1L;
            
            var result = -1L ^ mask;
            result = ~~result;
            Console.WriteLine(result.ToString("X"));
            
            Console.WriteLine(DateTime.Parse("2017-05-19T18:28:28.7168282-05:00").ToUniversalTime());
        }
    }
}