def clear_start_date(self):
if (self.get_start_date_metadata().is_read_only() or<EOL>self.get_start_date_metadata().is_required()):<EOL><INDENT>raise NoAccess()<EOL><DEDENT>default_start_date = self._start_date_metadata['<STR_LIT>'][<NUM_LIT:0>]<EOL>self.my_osid_object_form._my_map['<STR_LIT>'] = DateTime(year=default_start_date.year,<EOL>month=default_start_date.month,<EOL>day=default_start_date.day,<EOL>hour=default_start_date.hour,<EOL>minute=default_start_date.minute,<EOL>second=default_start_date.second,<EOL>microsecond=default_start_date.microsecond)<EOL>
Clears the start date.

        raise:  NoAccess - ``Metadata.isRequired()`` or
                ``Metadata.isReadOnly()`` is ``true``
        *compliance: mandatory -- This method must be implemented.*