Quand pars-tu aujourd'hui? and Quand partez-vous aujourd'hui? are French equivalents of the English phrase "When do you leave today?" Context makes clear whether one "you" (case 1) or two or more "you all" (example 2) suits. The respective pronunciations will be "kaw par-tyoo o-zhoor-dwee" in the singular and "kaw par-tey-voo o-zhoor-dwee" in the plural in French.
"Today's" in English is d'aujourd'hui in French.
"Today, it was..." in English is Aujourd'hui, il a été... . in French.
Aujourd'hui in French means "today" in English.
"Today's lessons" in English is les cours d'aujourd'huiin French.
"Today" in English is aujourd'hui, pronounced "o-zhoor-dwee," in French.
"Not today, sir!" in English is Pas aujourd'hui, Monsieur! in French.
"I have missed you today!" in English is Tu m'as manqué aujourd'hui! in French.
"What are you doing today?" in English is Que faites-vous aujourd'hui? in French.
"That is all for today!" in English is C'est tout pour aujourd'hui! in French.
"I am fine today!" in English is Je vais très bien aujourd'hui! in French.
"I am in the office today!" in English is Aujourd'hui, je suis au bureau! in French.
"Today, we did a bit of..." in English is Aujourd'hui, on a fait un peu de... in French.