Sample C#

public DateTime GetBuildDate(Assembly assembly)
{
	var location = assembly.Location;
	const int headerOffset = 60;
	const int linkerTimestampOffset = 8;
	var buffer = new byte[2048];
	Stream stream = null;

	try
	{
		stream = new FileStream(location, FileMode.Open, FileAccess.Read);
		stream.Read(buffer, 0, 2048);
	}
	finally
	{
		if (stream != null)
		{
			stream.Close();
		}
	}

	var i = BitConverter.ToInt32(buffer, headerOffset);
	var secondsSince1970 = BitConverter.ToInt32(buffer, i + linkerTimestampOffset);
	var dt = new DateTime(1970, 1, 1, 0, 0, 0);
	dt = dt.AddSeconds(secondsSince1970);
	dt = dt.AddHours(TimeZone.CurrentTimeZone.GetUtcOffset(dt).Hours);
	return dt;
}

Sample VB.NET

Public Function GetBuildDate(assembly as Assembly) As DateTime
	Dim location = assembly.Location
	Const  headerOffset As Integer = 60
	Const  linkerTimestampOffset As Integer = 8
	Dim buffer = New Byte(2047) {}
	Dim stream As Stream = Nothing

	Try
		stream = New FileStream(location, FileMode.Open, FileAccess.Read)
		stream.Read(buffer, 0, 2048)
	Finally
		If stream IsNot Nothing Then
			stream.Close()
		End If
	End Try

	Dim i = BitConverter.ToInt32(buffer, headerOffset)
	Dim secondsSince1970 = BitConverter.ToInt32(buffer, i + linkerTimestampOffset)
	Dim dt = New DateTime(1970, 1, 1, 0, 0, 0)
	dt = dt.AddSeconds(secondsSince1970)
	dt = dt.AddHours(TimeZone.CurrentTimeZone.GetUtcOffset(dt).Hours)
	Return dt
End Function