On our server it looks like this:

However in the docs it looks like this:

Look at the start of the week: On our server it starts with Monday and in the docs it starts with Sunday.
The thing is if I set it on our server corresponding to our GUI then it does not work correctly: The times I set for "Monday" where actually for "Sunday". The times I set for "Friday" are then in turn actually for "Thursday".
This morning I had an angry call because Veeam filled up our internet.