1. corrected compilation of wxTime/wxDate

2. wxDateTime::Format() seems to work (look at it to see why I'm so happy)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5049 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/datetime.inl

@@ -222,11 +222,21 @@ wxTimeSpan wxDateTime::Substract(const wxDateTime& datetime) const
     return wxTimeSpan(datetime.GetValue() - GetValue());
 }
 
+wxDateTime wxDateTime::Add(const wxDateSpan& diff) const
+{
+    return wxDateTime(*this).Add(diff);
+}
+
 wxDateTime& wxDateTime::Substract(const wxDateSpan& diff)
 {
     return Add(diff.Negate());
 }
 
+wxDateTime wxDateTime::Substract(const wxDateSpan& diff) const
+{
+    return wxDateTime(*this).Substract(diff);
+}
+
 wxDateTime& wxDateTime::operator-=(const wxDateSpan& diff)
 {
     return Substract(diff);