Extension methods for System.Reflection.Assembly.* Returns the DateTime represented by the linker timestamp in the specified assembly.

AssemblyExtensions.cs

using System;
using System.IO;
using System.Reflection;

/// <summary>
/// Extension methods for the Assembly class.
/// </summary>
internal static class AssemblyExtensions
{
    /// <summary>
    /// Returns the DateTime represented by the linker timestamp in the specified assembly.
    /// </summary>
    /// <param name="assembly">The assembly to extract the linker timestamp from.</param>
    /// <returns>
    /// The DateTime represented by the linker timestamp in the specified assembly.
    /// </returns>
    public static DateTime GetLinkerTimestamp(this Assembly assembly)
    {
        if (assembly == null)
            throw new ArgumentNullException("assembly should not be null", "assembly");

        const int peHeaderOffset = 60;
        const int linkerTimestampOffset = 8;

        byte[] buffer = new byte[2048];
        string path = assembly.Location;
        using (Stream stream = new FileStream(path, FileMode.Open, FileAccess.Read))
        {
            stream.Read(buffer, 0, buffer.Length);
        }

        int i = BitConverter.ToInt32(buffer, peHeaderOffset);
        int secondsSince1970 = BitConverter.ToInt32(buffer, i + linkerTimestampOffset);

        DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);
        dateTime = dateTime.AddSeconds(secondsSince1970);
        dateTime = dateTime.AddHours(TimeZone.CurrentTimeZone.GetUtcOffset(dateTime).Hours);
        return dateTime;
    }
}