function upgrade_270() { global $wp_current_db_version,
$wpdb;
if ( $wp_current_db_version < 8980
) { populate_roles_270();
} // Update post_date for unpublished posts with empty timestamp.
if ( $wp_current_db_version < 8921
) { $wpdb->
query( "UPDATE
$wpdb->posts SET post_date = post_modified WHERE post_date = '0000-00-00 00:00:00'"
);
}}/**
* Execute changes made in WordPress 2.8.
*
* @ignore
* @since 2.8.0
*
* @global int $wp_current_db_version The old (current) database version.
* @global wpdb $wpdb WordPress database abstraction object.
*/