Days of the Week

Monday	lunes	loo-nays
Tuesday	martes	mar-tays
Wednesday	miércoles	mee-air-coh-lays
Thursday	jueves	hway-bays
Friday	viernes	bee-air-nays
Saturday	sábado	sah-bah-doh
Sunday	domingo	doh-ming-oh
day	el día	dee-ah
week	la semana	say-mahn-ah
weekend	el fin de semana	feen day say-mahn-ah
today	hoy	oy
tonight	esta noche	es-tah noh-chay
last night	anoche	ah-noh-chay
yesterday	ayer	eye-yair
tomorrow	mañana	mahn-yahn-ah
my birthday	mi cumpleaños	mee coom-play-ahn-yohs
next	próximo / próxima	prok-see-moh / mah
last	pasado / pasada	pah-sah-doh / dah
day before yesterday	anteayer	ahn-teh-eye-yair
day after tomorrow	pasado mañana	pah-sah-doh mahn-yahn-ah
the following day	el día siguiente	dee-ah see-gwee-ehn-teh
the day before	la víspera	vees-peh-rah

Days of the week are all masculine in gender and they are not capitalized in writing. The definite article is not used after the verb ser, but at all other times it is required and there is slight change in meaning if it is singular or plural: el lunes = on Monday but los lunes = on Mondays