// Set constraint Finish No Earlier Than on task with Id 2
System::SharedPtr<Task> first = project1->get_RootTask()->get_Children()->GetById(2);
first->Set<ConstraintType>(Tsk::ConstraintType(), Aspose::Tasks::ConstraintType::FinishNoEarlierThan);
first->Set(Tsk::ConstraintDate(), System::DateTime(2016, 12, 1, 18, 0, 0));
    
// Save project as pdf
System::SharedPtr<SaveOptions> options = System::MakeObject<PdfSaveOptions>();
options->set_StartDate(project1->Get<System::DateTime>(Prj::StartDate()));
options->set_Timescale(Aspose::Tasks::Visualization::Timescale::ThirdsOfMonths);
project1->Save(dataDir + u"project_FinishNoEarlierThan_out.pdf", options);