Rolling Calendar

Hello! I need a spreadsheet to track employee absence occurrences.
I.E. out all day 1 point, Half day 1/2 point

This spreadsheet works for everything that I am looking for EXCEPT I need it to have a rolling year.
ex I want to be able to see June 2018 and scroll out to July 2019.
We track absences and they fall off a year from the day that they occur.

Any help or suggestions would be appreciated!