It depends, if you're being formal (speaking to someone you don't know well) you could say: Was machst Sie heute?
If you're being informal (speaking to a friend) you could say: Was machst Du heute?
I don't know much German so I may not be correct.
today = heute
What are you doing today is Was machst du heute in German.
Wie gehts heute?
french: aujourd'hui german: heute latin: hodie
aufwaerts
aufstehen
German translation for "What's up?" is: "Was ist los?"
Ich habe heute Fußball(training).
Heute ist ein guter Tag zum Sterben is the German translation.
What's up? means in German "Na, wie geht's?", or "Was ist los?", or "Was geht?".
Schöner sonniger Tag heute
aufgeräumt is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.