It would indeed be correct, throwing it into Orchestrator will let you know if it is valid or not, and when viewing the triggers - The trigger details will indicate in plain how it is being interpreted.
At 12:05 AM, on day 1 of the month
Or in Ganta’s example 0 5 0 1 1-12 ? * At 12:05 AM, on day 1 of the month, January through December
UiPath using the Quartz.NET Framework for Cron have a read over the documentation if you haven’t already it is pretty helpful.
Quartz implements 7 field cron-expressions with the last one (year) being optional.