@utilities.arguments_not_none<EOL><INDENT>def set_start_date(self, date):<DEDENT>
raise errors.Unimplemented()<EOL>
Sets the start date.

        arg:    date (osid.calendaring.DateTime): the new date
        raise:  InvalidArgument - ``date`` is invalid
        raise:  NoAccess - ``Metadata.isReadOnly()`` is ``true``
        raise:  NullArgument - ``date`` is ``null``
        *compliance: mandatory -- This method must be implemented.*