Hi Tiago,
For this, you’ll need to use Cron expressions. The generator I rely on is Free Online Cron Expression Generator and Describer - FreeFormatter.com
For example, your scenario, 0 0 9 5 * ? * would work. This runs on the 5th day of every month, at 9am. 0 0 0 5 * ? * would run at midnight of the 5th day of the month.
0 0 0 5W * ? * would work for the nearest weekday to the 5th of the month, but I’ll be honest, I’m not entirely sure on getting it to run on exactly the 5th working day of the month, as I’ve never had this as a requirement.
Have a play around on the link above and see if you can get your exact requirement, but hopefully the above examples should help you!
Cheers,
Josh