using System;

int bitshift = 32;

var v = DateTime.Now.Ticks;

var masksize = sizeof(long)*8 - bitshift;

var mask = (long.MaxValue<<masksize)&v;

Console.WriteLine(Convert.ToString(mask,2).PadLeft(8,'0'));

Console.WriteLine(Convert.ToString(mask&v,2).PadLeft(8,'0'));

Console.WriteLine(Convert.ToString(v,2).PadLeft(8,'0'));

Console.WriteLine(masksize);

Console.WriteLine(v.ToString("X2") + "  "+ new DateTime(v).ToString("yyyy-MMM-dd hh:mm:ss.ffffff"));

v = v << bitshift;

v = v >> bitshift;

Console.WriteLine(v.ToString("X2")+"  "+ new DateTime(mask|v).ToString("yyyy-MMM-dd hh:mm:ss.ffffff"));

Console.WriteLine(Convert.ToString(v,2).PadLeft(8,'0'));

​