Shift change request
Shift change requests are about a lasting move, not one day. Somebody's study timetable moves, a commute changes, a caring arrangement shifts. The form makes the new window explicit and dates the day it starts.
Questions people ask about this letter
How much notice should a shift change need?
Set the notice period in your own policy and print it on the form. It varies by country and by contract, so no template can fill it in for you.
Can a request be declined without a reason?
It can, but it should not be. A written reason is what stops two similar requests getting two different answers.
What happens to attendance on the day the change starts?
The new window applies from that date. Anything measured against the old one after that produces late marks that are not real.