docs: def clear_start_time(self):
          """Clears the start time.
  
          raise:  NoAccess - ``Metadata.isRequired()`` or
                  ``Metadata.isReadOnly()`` is ``true``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for osid.assessment.AssessmentOfferedForm.clear_start_time_template
          if (self.get_start_time_metadata().is_read_only() or
                  self.get_start_time_metadata().is_required()):
              raise errors.NoAccess()
          self._my_map['startTime'] = self._start_time_default