Spanish Grammar: Days of the Week

Unlike English, the days of the week in Spanish are not capitalized unless at the beginning of a sentence. This is of course the opposite of English. Another difference is that the Spanish week begins with el lunes (Monday) rather than el domingo (Sunday).

Hoy es lunes.
Today is Monday.

Es martes el dos de mayo.
It is Tuesday the second of May.

el lunes	Monday
el martes	Tuesday
el miércoles	Wednesday
el jueves	Thursday
el viernes	Friday
el sábado	Saturday
el domingo	Sunday

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The definite article is generally required before the days of
the week.

Trabajo los jueves.
I work on Thursdays.

No me gustan los lunes.
I don't like Mondays.

Lo haremos el miércoles.
We will do it on Wednesday.

Exception: The definite article is not used with the days of the week when they follow the verb ser or when the days of the week are preceded by the adjectives cada, muchos, pocos, or by any number.

Hoy es martes.
Today is Tuesday.

Mañana será miércoles.
Tomorrow will be Wednesday.

Vamos al cine cada sábado.
We go to the movies every Saturday.

Él trabajó muchos domingos el año pasado.
He worked many Sundays last year.

Hoy es domingo; mañana es lunes.
Today is Sunday; tomorrow is Monday.

Vamos al cine cada sábado.
We go to the movies every Saturday.

Hay cinco domingos en este mes.
There are five Sundays in this month.

The English preposition on before a day of the week is expressed by the definite article. The preposition at is translated as a when used with time.

Tengo una cita el sábado a las seis.
I have a date on Saturday at six.

No trabajamos los lunes.
We don't work on Mondays.

The days of the week in Spanish are masculine and with the exceptions of
sábado (Saturday) and domingo (Sunday) they are made plural by placing los (the plural definite article) before them. Sábado (Saturday) and domingo (Sunday) plurals are formed by by placing los before them adding an -s.

Los lunes hay mucho tráfico.
There is a lot of traffic on Mondays.

Suelo salir los viernes.
I usually go out on Fridays.

But:

No estudio los domingos.
I don't study on Sundays.

Siempre voy al mercado los sábados.
I always go to the market on Saturdays.