I have heard...."¿como ha sido tu dia hoy?" = How has your day been...... if you want a literal translation.
The question leaves it open for you to (fill in the blank) for lack of a better expression...
Hoy, mi día ha sido .....
-duro
-difícil
-muy ocupado
-despacio
-aburrido
I don't see anything wrong with that expression.
my
