Error Lnk2005: New and Delete Already Defined in Libcmtd.Lib(New.Obj)

Linker error: already defined

I fixed the problem: I found that it is a problem with the order of the includes. However forcing every file to have the afx.h include (properties->c/c++/advanced/force include file)
fixed the problem for me.

error LNK2005 constructor already defined

As it is, the Date::Date constructor is defined in date.h and will therefore be (re)defined in any .cpp that includes date.h, in your case (at least) club.cpp and date.cpp. Same goes for the Date::~Date destructor.

You can either (a) move the Date::Date and Date::~Date definitions to date.cpp, or (b) define them as inline in date.h:

class Date
{
public:
    Date::Date(int j, int m, int a)
    {
        jour = j;
        mois = m;
        annee = a;
    }

    Date::~Date()
    {
    }

    //...

Visual Studio Linking errors. Order in which MFC, CRT included?

This was clarified to me on the MSDN Forumns:
http://social.msdn.microsoft.com/Forums/en/vcgeneral/thread/4e331cb3-e566-4ca6-b7d4-118c3bebd31a

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