Hi. There is two ways to handle it. Check and mark your year calendar.

One like before and after school programs do. You can take all the stat. Holidays plus end of the year holidays and adD the PD days (use the school calendar for this) once you have a total of these full days then pro-rate this amount and built it into your daily rate. So, parents pay kind of a just one daily fee that includes the other full day services. I have seen parents paying monthly almost the same amount as a full days daycare. Only $200 or $300 was the diference. After school before and after school programs built all their pricing based in ten monthly payments which covers all. And twelve months if the programs remain open during summer.

The second option, you charge your daily fee let's say $25 for before and after and when they have PD days you charge a fee for full day. And also try to charge stat holidays as a prorated fee or full fee (this is optional to you ). I've seen friends charge during Christmas and new year charge as the regular $25 fee. And they remain closed (those are family holidays) or if you're open same as the march break you will have to stablishow and charge a full day fee.

I hope it helps. Good luck.