Unlike in English, the days of the week & months of the year aren’t written with a capital letter. In Spanish, only the names of people, places & the internet (which I suppose is a place?) have capital letters.
Los días de la semana – The days of the week
lunes – Monday
martes – Tuesday
miércoles – Wednesday
jueves – Thursday
viernes – Friday
sábado – Saturday
domingo – Sunday
Los meses del año – The months of the year
enero – January
febrero – February
marzo – March
abril – April
mayo – May
junio – June
julio – July
agosto – August
septiembre – September
octubre – October
noviembre – November
diciembre – December
Las estaciones – The seasons
primavera – spring
verano – summer
otoño – autumn
invierno – winter
Horas / tiempos del día – Times of day
From sunrise until lunchtime
(taking into account that lunch is eaten at around 2pm or 3pm )
la mañana – morning
From after lunch until around sunset
la tarde – afternoon / evening
From sunset until midnight
la noche – night
From midnight until sunrise
A few tips……
If we want to say that something is going to happen on Monday – we say ‘the’ Monday – el lunes
I’m going to buy a car on Monday – Voy a comprar un coche el lunes.
If we want to say that something happens every Tuesday, there are several ways of saying it.
We can simply that it happens on ‘the’ Tuesdays – remembering to pluralise ‘the’ & conjugate it to / make it ‘fit’ the day – all days are masculine.
Do you work every Tuesday? – ¿Trabajas los martes?
We can use ‘todo’ which means ‘all’. again we have to pluralise & conjugate / make it fit
Jorge works on Wednesdays – Trabaja todos los miércoles, Jorge.
The easiest though, is to use the word ‘cada’, which means ‘each’ or ‘every’. This is the easiest because it doesn’t have to be pluralised nor conjugated!!
We work on Thursdays – Trabajamos cada jueves.
If we want to say that we do something in July, for instance, or in a season – we use the word en for ‘in’
María & Ana always swim in the sea in July – Siempre nadan en el mar en julio María y Ana.
However… if we want to say that something happens in the morning – we say por la mañana
You & Javier drink wine in the evening, don’t you? Tomáis vino por la tarde, tú y Javier ¿No?