monthly schedule multiple times on day X

Besides having two jobs for this monthly process, can job scheduler be setup to run on job as follows:

at minutes :30, :45, on hour 0, on day 3, every month.

Assuming you want to kick off some processes, you can create 1 monthly job of script type, for example, JavaScript; schedule it to start at 12:30 am on 3rd day of each month, and in the script put something like

Process.run("/home/jobs/process-1.sh");
Scheduler.pause(900);
Process.run("/home/jobs/process_2.sh");

this will launch process_1.sh wait 15 minutes (900 seconds) and launch process_2.sh

thank you