lunes: Monday

martes: Tuesday

miercoles: Wednesday

jueves: Thursday

viernes: Friday

Sabado: Saturday

Domingo: Sunday

Spanish days of the week are NOT capitalized

que dia es hoy: What day is today?

Hoy es: today is

que dia fue Ayer: what day is today

Ayer fue: yesterday was

que da sera manana: what day will tomorrow be

manana sera: tomorrow will be

manana: tomorrow

hoy: today

Ayer: Yesterday

el can mean on in relation to a day

Los can mean on in relation to multiple days