days of the week
The days of the week in Spanish are lunes, martes, miércoles, jueves, viernes, sábado, and domingo. Unlike in English, they are not capitalized unless they start a sentence, and they are masculine nouns (e.g., "el lunes"). They are derived from the Latin names for celestial bodies: the Moon, Mars, Mercury, Jupiter, Venus, Saturn, and the Sun (Lord's Day). When talking about a specific day, use the article "el" (for singular) or "los" (for plural). If you want to say something happens *on* a specific day, you simply use the article; you do not need a preposition like "on." For example, "I work on Mondays" becomes "Trabajo los lunes."
In conversation
Planning a meeting
¿Qué día te viene mejor?
Which day works best for you?
El martes estoy libre todo el día.
On Tuesday I am free all day.
Note that 'El martes' is used to indicate the specific day without needing a preposition.
Checking a schedule
No trabajo los fines de semana.
I don't work on weekends.
Entendido, entonces nos vemos el lunes.
Understood, then we'll see each other on Monday.
'Fines de semana' refers to Saturday and Sunday collectively.
Examples
Hoy es lunes.
Today is Monday.
Tengo una cita médica el miércoles por la mañana.
I have a doctor's appointment on Wednesday morning.
Los viernes solemos salir a cenar con los amigos.
On Fridays, we usually go out to dinner with friends.
