friend bool WXDLLEXPORT operator == (const wxDate &dt1, const wxDate &dt2);
friend bool WXDLLEXPORT operator != (const wxDate &dt1, const wxDate &dt2);
+#if wxUSE_STD_IOSTREAM
friend ostream WXDLLEXPORT & operator << (ostream &os, const wxDate &dt);
+#endif
wxString FormatDate (int type=-1) const;
void SetFormat (int format);