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Delphi DLL TDateTime call from C#

I got a Delphi DLL function using D2007 has parameter type of Double (used for as TDateTime).

I tried to call from C#:
eg.
DateTime week;
week = DateTime.Now;

myDLLFunc(week.Date);

I got a runtime error:
Cannot marshal 'parameter #1': Invalid managed/unmanaged type combination(the DateTime class must be paired with Struct).

What should I pass the date parameter?
Jul 2 '10 #1
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