Quartz cron trigger for every two hours between 8 AM to 6 PM and once at 11:59 PM

Quartz cron trigger for every two hours between 8 AM to 6 PM and once at
11:59 PM

I have been trying to add the requirement in the quartz cron trigger.Below
are the expressions i have come with ,
0 0 8,10,12,14,16,18 ? * *
0 0 8-18/2 ? * *
Are the above ones correct.Also How do I add the 11:59 PM trigger in the
above.
Please help