@utilities.arguments_not_none<EOL><INDENT>def set_start_time(self, start):<DEDENT>
<EOL>if self.get_start_time_metadata().is_read_only():<EOL><INDENT>raise errors.NoAccess()<EOL><DEDENT>if not self._is_valid_date_time(<EOL>start,<EOL>self.get_start_time_metadata()):<EOL><INDENT>raise errors.InvalidArgument()<EOL><DEDENT>self._my_map['<STR_LIT>'] = start<EOL>
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.*