"Today" in Spanish is "hoy". Sometimes you may see "hoy día". The term "actual" or "actualmente" can sometimes be interpreted that way as well.
Say 'llámame hoy'
hoy es
planchar
You say, "Si me muera hoy..."
Hoy VA al mercado. - Today you are going to the market. Hoy voy al mercado. - Today I am going to the market.
"Today is Wednesday," would be translated as "Hoy es miércoles."
lo que es hoy
Esta feliz ahora?
Hoy es martes.
como esta usted?
¿Te veré hoy?
No hice nada hoy