Create class for build date using a T4 template

BuildInfo.tt

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ output extension=".cs" #>
<#@ Assembly Name="EnvDTE.dll" #>
<#@ Assembly Name="System.Data" #>
<#@ import namespace="EnvDTE" #>
<#@ import namespace="System.Data" #>
<#@ import namespace="System.Globalization" #>
<#@ import namespace="System.IO" #>
<#@ import namespace="System.Text.RegularExpressions" #>


<#@ output extension=".cs" #>
<#
    var tableName = Path.GetFileNameWithoutExtension(Host.TemplateFile);
    var path = Path.GetDirectoryName(Host.TemplateFile);
    const string FMT_DATE_FORMAL            = "";
    const string FMT_DATE_COMMENT           = "MMMM d, yyyy h:mm:ss.ffffff tt";

    DateTime dtBuildDate            = DateTime.UtcNow;
    string   strNamespace           = "BogusStuff";
    string   strFormatDisplay       = String.IsNullOrEmpty(FMT_DATE_FORMAL) ? CultureInfo.InstalledUICulture.DateTimeFormat.FullDateTimePattern : FMT_DATE_FORMAL;


	// Get containing project
	IServiceProvider serviceProvider = (IServiceProvider)Host;
	DTE dte = (DTE)serviceProvider.GetService(typeof(DTE));
	Project project = dte.Solution.FindProjectItem(Host.TemplateFile).ContainingProject;

#>
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
// NOTICE: DO NOT EDIT THIS FILE!
// 
// This file is autogenerated and your changes will be OVERWRITTEN! 
// Edit the corresponding .tt file instead.
//
// Or, better yet, make a lasting contribution by submitting a Pull Request:  
//      https://github.com/dwcullop/BuildInfo
//
// This version was modified by Karen Payne
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
using System;
using System.Reflection;

namespace <#= project.Properties.Item("DefaultNamespace").Value #><#= Path.GetDirectoryName(Host.TemplateFile).Remove(0, Path.GetDirectoryName(project.FileName).Length).Replace("\\", ".") #>
{
    public static class BuildInfo
    {
        private const long              BUILD_DATE_BINARY_UTC       = 0x<#=dtBuildDate.ToBinary().ToString("x16") #>;    // <#=dtBuildDate.ToString(FMT_DATE_COMMENT) #> UTC

        private static AssemblyName     BuildAssemblyName { get; }  = Assembly.GetExecutingAssembly().GetName();
        public static DateTimeOffset    BuildDateUtc { get; }       = DateTime.FromBinary(BUILD_DATE_BINARY_UTC);
        public static string            ModuleText { get; }         =  BuildAssemblyName.Name;
        public static string            VersionText { get; }        = "v" + BuildAssemblyName.Version.ToString()
#if DEBUG
                                                                                + " [DEBUG]"
#endif
                                                                                ;

        public static string            BuildDateText { get; }      = "<#=dtBuildDate.ToString(strFormatDisplay) #> UTC";
        public static string            DisplayText { get; }        = $"{ModuleText} {VersionText} (Build Date: {BuildDateText})";
    }
}

Under properties for BuildInfo.tt set Custom Tool to TextTemplatingFileGenerator, save the file and BuildInfo.cs is generated.

Usage

private void BuildInfo_Click(object sender, EventArgs e)
{
    MessageBox.Show(BuildInfo.BuildDateText);
}

Note

The original code at the original repository worked except it didn't pickup on the default namespace, this version does for .NET Core. So first try the original if using .NET traditional Framework e.g. .NET 4.8 and if it fails use this version.