attempting to save it service with some of the uptime/downtime at "Never" (https://support.zabbix.com/browse/ZBX-2787) results in sql errors :

Error in query [INSERT INTO services_times (timeid,serviceid, type, ts_from, ts_to, note) VALUES(3,1,0,,1280638920,'')] [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1280638920,'')' at line 1]
Error in query [INSERT INTO services_times (timeid,serviceid, type, ts_from, ts_to, note) VALUES(4,1,0,,1280635260,'')] [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1280635260,'')' at line 1]