code: def set_start_time(self, start):
          
          # Implemented from template for osid.assessment.AssessmentOfferedForm.set_start_time_template
          if self.get_start_time_metadata().is_read_only():
              raise errors.NoAccess()
          if not self._is_valid_date_time(
                  start,
                  self.get_start_time_metadata()):
              raise errors.InvalidArgument()
          self._my_map['startTime'] = start
docs: Sets the assessment start time.
  
          arg:    start (osid.calendaring.DateTime): assessment start time
          raise:  InvalidArgument - ``start`` is invalid
          raise:  NoAccess - ``Metadata.isReadOnly()`` is ``true``
          *compliance: mandatory -- This method must be implemented.*