Quarter Sets

What is the formula for an Excel spreadsheet with a moving quarter?

My companies attendance program calculates points within a moving quarter. If an employee accumulates 3 points within 90 days then he or she will earn some sort of disciplinary action. Can I set up a formula to count only every 90 days and still keep track of their total attendance? Thanks in advance!
The data is populated as employees on the left (A) and the dates they have been absent on the right (column headers). Each employee earns a point to the right of their name when they are absent, etc.. The total points accured are talleyed beside their name.

Instead of trying to explain it in text,
I made a little file as an example.
Try downloading this file.
Good luck!

America the Beautiful National Parks 5-piece Quarter Set…