CAESDO.Recruitment.Web.MasterPage.RetrieveLinkerTimestamp C# (CSharp) Method

RetrieveLinkerTimestamp() private method

Grabs the build linker time stamp
http://stackoverflow.com/questions/2050396/getting-the-date-of-a-net-assembly and http://www.codinghorror.com/blog/2005/04/determining-build-date-the-hard-way.html
private RetrieveLinkerTimestamp ( string filePath ) : System.DateTime
filePath string
return System.DateTime
        private DateTime RetrieveLinkerTimestamp(string filePath)
        {
            const int peHeaderOffset = 60;
            const int linkerTimestampOffset = 8;
            var b = new byte[2048];
            System.IO.FileStream s = null;
            try
            {
                s = new System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
                s.Read(b, 0, 2048);
            }
            finally
            {
                if (s != null)
                    s.Close();
            }
            var dt = new DateTime(1970, 1, 1, 0, 0, 0).AddSeconds(BitConverter.ToInt32(b, BitConverter.ToInt32(b, peHeaderOffset) + linkerTimestampOffset));
            return dt.AddHours(TimeZone.CurrentTimeZone.GetUtcOffset(dt).Hours);
        }