Variant Records in Delphi.Net

How do you convert Variant Records to a safe type in Delphi.Net?  For example, I want to use the following type in a .Net program

type
  TMyDate = packed record
    case boolean of
      true  : (date : integer);
      false : (day : byte;
               month : byte;
               year : smallint);
  end;

I've seen references to using a StructLayout and FieldOffset attribute but I can't find any examples.
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