Portuguese weekdays derive from lithurgic latin, i.e. "tertia feria" = "terça-feira", meaning third day (as Sunday is the first day of the week, for Christians)
On the other hands Spain, Italy France and Romania derive their weekdays from "pagan" origins, using the Roman deities as reference. "Martis Dies" (Day of Mars) is Martes, Martedi, Mardi, and Marti.
It's one of those cases where I think Portuguese, being a Latin (Romance) language makes more sense than all the others... in particular Italian.
-feira is at the end of every weekday
On the other hands Spain, Italy France and Romania derive their weekdays from "pagan" origins, using the Roman deities as reference. "Martis Dies" (Day of Mars) is Martes, Martedi, Mardi, and Marti.
It's one of those cases where I think Portuguese, being a Latin (Romance) language makes more sense than all the others... in particular Italian.