DESCRIPTION
Calculates instructional days for a certain quarter to
schedule client authorizations. It is not pretty but it
will save us up to 30 minutes a year. I KNOW!
TODO
- rewrite in purescript
- it only works with a period in the same year
- does not check if period is valid (e.g. 11/27 - 7/1)
- add ranges (9/1..10/31) - would help in excluded dates
- add frontend