Getting the date of a .NET assembly [duplicate]

Answer 1

The following is based on: https://blog.codinghorror.com/determining-build-date-the-hard-way/

public static class ApplicationInformation
{
    /// 

    /// Gets the executing assembly.
    /// 
    /// The executing assembly.
    public static System.Reflection.Assembly ExecutingAssembly
    {
        get { return executingAssembly ?? (executingAssembly = System.Reflection.Assembly.GetExecutingAssembly()); }
    }
    private static System.Reflection.Assembly executingAssembly;

    /// 

    /// Gets the executing assembly version.
    /// 
    /// The executing assembly version.
    public static System.Version ExecutingAssemblyVersion
    {
        get { return executingAssemblyVersion ?? (executingAssemblyVersion = ExecutingAssembly.GetName().Version); }
    }
    private static System.Version executingAssemblyVersion;

    /// 

    /// Gets the compile date of the currently executing assembly.
    /// 
    /// The compile date.
    public static System.DateTime CompileDate
    {
        get
        {
            if (!compileDate.HasValue)
                compileDate = RetrieveLinkerTimestamp(ExecutingAssembly.Location);
            return compileDate ?? new System.DateTime();
        }
    }
    private static System.DateTime? compileDate;

    /// 

    /// Retrieves the linker timestamp.
    /// 
    /// The file path.
    /// 
    /// http://www.codinghorror.com/blog/2005/04/determining-build-date-the-hard-way.html
    private static System.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 System.DateTime(1970, 1, 1, 0, 0, 0).AddSeconds(System.BitConverter.ToInt32(b, System.BitConverter.ToInt32(b, peHeaderOffset) + linkerTimestampOffset));
        return dt.AddHours(System.TimeZone.CurrentTimeZone.GetUtcOffset(dt).Hours);
    }
}