include dates in schema

lib/api/v3/work_packages/form/work_package_schema_representer.rb

@@ -47,6 +47,12 @@ module API
           property :description,
                    getter: -> (*) { { type: 'Formattable' } },
                    writeable: false
+          property :startDate,
+                   getter: -> (*) { { type: 'Date' } },
+                   writeable: false
+          property :dueDate,
+                   getter: -> (*) { { type: 'Date' } },
+                   writeable: false
           property :status,
                    exec_context: :decorator,
                    getter: -> (*) {

spec/lib/api/v3/work_packages/form/work_package_schema_representer_spec.rb

@@ -93,6 +93,18 @@ describe ::API::V3::WorkPackages::Form::WorkPackageSchemaRepresenter do
         it_behaves_like 'schema property', 'subject', 'String'
       end
 
+      describe 'description' do
+        it_behaves_like 'schema property', 'description', 'Formattable'
+      end
+
+      describe 'startDate' do
+        it_behaves_like 'schema property', 'startDate', 'Date'
+      end
+
+      describe 'dueDate' do
+        it_behaves_like 'schema property', 'dueDate', 'Date'
+      end
+
       describe 'status' do
         shared_examples_for 'contains statuses' do
           it_behaves_like 'linked property', 'status', 'Status'