updated mac sources (CW 5.3 working , CW6 still having code gen problems)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9334 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/datetime.h

@@ -36,6 +36,19 @@ class WXDLLEXPORT wxDateSpan;
     #define inline
 #endif // Debug
 
+// not all c-runtimes are based on 1/1/1970 being (time_t) 0
+// set this to the corresponding value in seconds 1/1/1970 has on your
+// systems c-runtime
+
+#ifdef __WXMAC__
+#if __MSL__ < 0x6000
+	#define WX_TIME_BASE_OFFSET ( 2082844800L + 126144000L )
+#else
+	#define WX_TIME_BASE_OFFSET 0
+#endif
+#else
+	#define WX_TIME_BASE_OFFSET 0
+#endif
 /*
  * TODO
  *