...and who gave YOU permission??

Doing my Spanish on Rosetta Stone, I got to the part when they attempt to teach me the days of the week.
"Sabado" 
"Okay I know that one."
*Click on 7th day of the week*
WRONG.
"What??"
Turns out, they've made Saturday the 6th day, and Sunday the 7th..... Ummmmm?