CustomVersionProvider.cs

public class CustomVersionProvider : IVersionProvider
    {
        private Lazy<string> _productVersion = new Lazy<string>(() =>
        {
            var assembly = Assembly.GetExecutingAssembly();
            var assemblyVersion = assembly.GetName().Version;
            var productVersion = string.Format("{0}.{1}.{2}", assemblyVersion.Major, assemblyVersion.Minor, assemblyVersion.Build);
            // additional info
            var dateFormat = "dd.MM.yyyyTHH:mm:ss";
            productVersion += string.Format(" (built: {0}) (LastWriteTime: {1})",
                GetLinkerTime(assembly).ToString(dateFormat),
                File.GetLastWriteTime(assembly.Location).ToString(dateFormat));
            return productVersion;
        });

        public string GetVersion()
        {
            return _productVersion.Value;
        }

        private static DateTime GetLinkerTime(Assembly assembly, TimeZoneInfo target = null)
        {
            var filePath = assembly.Location;
            const int c_PeHeaderOffset = 60;
            const int c_LinkerTimestampOffset = 8;

            var buffer = new byte[2048];

            using (var stream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                stream.Read(buffer, 0, 2048);

            var offset = BitConverter.ToInt32(buffer, c_PeHeaderOffset);
            var secondsSince1970 = BitConverter.ToInt32(buffer, offset + c_LinkerTimestampOffset);
            var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

            var linkTimeUtc = epoch.AddSeconds(secondsSince1970);

            var tz = target ?? TimeZoneInfo.Local;
            var localTime = TimeZoneInfo.ConvertTimeFromUtc(linkTimeUtc, tz);

            return localTime;
        }
    }

IVersionProvider.cs

public interface IVersionProvider
{
    string GetVersion();
}