i want to work with recurrent events and generate date in calendar in VBA

So i am asking if you have any idea or if you can point me to the right direction to be able to generate a yearly calendar where multiple recurrent events ( by hours ex: 40 hours , 100h ,2000h) and they get to be put on a calendar. I have a table for different machine and their respective periodic predictive maintenance but the intervals are in hours and even if i do trasnlate them in days i dont know how to generate a calendar that gets filled automatically.