code: def set_published_date(self, published_date):
          
          # Implemented from template for osid.assessment.AssessmentOfferedForm.set_start_time_template
          if self.get_published_date_metadata().is_read_only():
              raise errors.NoAccess()
          if not self._is_valid_date_time(
                  published_date,
                  self.get_published_date_metadata()):
              raise errors.InvalidArgument()
          self._my_map['publishedDate'] = published_date
docs: Sets the published date.
  
          arg:    published_date (osid.calendaring.DateTime): the new
                  published date
          raise:  InvalidArgument - ``published_date`` is invalid
          raise:  NoAccess - ``Metadata.isReadOnly()`` is ``true``
          raise:  NullArgument - ``published_date`` is ``null``
          *compliance: mandatory -- This method must be implemented.*