You say in spanish, as well, "menú del día".
El menú
"Kids' menu" can be expressed as "menú de niños".
"La carta" or "el munú"
menú, carta, lista de platos
"Day" in Spanish is día. Note the accent mark above the "i".
The way you say Mothers Day in Spanish is "Dia de Madre".
De forma cotidiana.
Quel dia?
¡Qué día!
One option is to say, "Qué sirven ustedes esta noche? literally, "What are you serving tonight?"
You could say "algún día".
Buenos dias = Good day