lunes
martes
miercoles
jueves
viernes
sabado
domingo
Cinco días por semana.
miércoles (days of the week, like month names, are not capitalized)
seis días de la semana
Mi cumpleaños es este jueves. Note the days of the week are not capitalized in Spanish.
hay siete dias en una semana
6 days a week
Sunday is "domingo" in Spanish. Note the days of the week are not capitalized in Spanish.
Feliz miércoles. Note that in Spanish, the days of the week do not begin with capital letters.
Thursday is "el jueves" in Spanish. Note that the days of the week are not capitalized in Spanish.
Both "what days of the week" and "which days of the week" are correct; however, "which days of the week" is typically used when the choices are limited, while "what days of the week" is more open-ended.
well in welsh they dont like to say days of the week they prefer to say a quick phrase such as my week days are cool or is my postman fat pat?
La semana.