Hello,
I could implement such standalone app on C# as a Windows Forms application.
Well, I did get large practical experience (and my code classes. code snippets) on various real-life projects related with conversion from VB6 to VB.NET/C# (please, look on my working history page here for info about some of such projects I completed) No problem for me in conversion from Delphi to C#. Please, be sure I'm a detail-oriented developer and I will perform such conversion very accurately, without rush but in fast manner. The application will get friendly GUI with calendars etc.
However, for now I have no Delphi installed on my computer, please could you simply send me a screenshot of the working Delphi form (in any its state) for review?
Anyways, we could start discussion of our possible collaboration for this project.
You are welcome.
Best regards
Igor