"Today is a great day" in Spanish is "Hoy es un gran día". It is pronounced "Oy ess oon grahn DEE-ah". Please see the Related link below for confirmation of the translation.
You say, "Marco pasó un día muy bueno."
"Que tengas un buen día con tu familia!"
tener un gran día de mañana
Roughly ... what day is this? What day is it today?
I don't speak Spanish, but according to Google translate it means: Great as has been their day.
"tuviste un mal dia"
In Ilocano, "have a great day" can be translated as "alaen ka a napintas a aldaw."
Como es su/tu dia ? (formal/informal)
Each=Cada Day=Dia (with an accent over the "i")
Tenga un buen dia con su familia.
"Happy Valentine's Day" translates to "Feliz Día de San Valentín" in Spanish.
¿Qué día es? = What day is it? ¿Qué día es hoy? = What day is it today? (Preferred Spanish sentence)