Starting a process at particular time which is stored in DB

Question

I have a requirement where the processes are scheduled within a range of 12 hours, let's say 3 PM to 3 AM, with a time gap of 1 hour. So my batch process should start at 3 PM but after first instance it should be triggered after every 1 hour till 3 AM. Is there any way we can achieve this using Timer event? 
 Also, I am recording the scheduled date and time in the database. Is it possible to directly get that time and start the process with it? 
 Any ideas how we can achieve this?

Kumar Agniwesh · Answer

I would use the following config on timer to fire it every hour 
 And to stop the process getting triggered outside the 12 hour window I would add an expression which would return false if current time is outside my window 
 contains(
 {
 "03:00 PM",
 "04:00 PM",
 "....",
 "03:00 AM"
 },
 text(now(), "HH:mm aa")
)