Comment vas-tu aujourd'hui? and Comment allez-vous aujourd'hui? are French equivalents of the English phrase "How are you doing today?" Context makes clear whether one "you" informally (case 1) or formally or two or more "you all" (example 2) suits. The respective pronunciations will be "kuh-maw va-tyoo o-zhoor-dwee" in the singular and "kuh-maw-ta-ley-voos o-zhoor-dwee" in the formal singular and formal and informal plural in French.
"What are you doing today?" in English is Que faites-vous aujourd'hui? in French.
Que faites-vous aujourd'hui? in French means "What are you doing today?" in English.
"Today's" in English is d'aujourd'hui in French.
"Today, it was..." in English is Aujourd'hui, il a été... . in French.
Qu'est-ce que tu fais aujourd'hui? in French means "What are you doing today?" or "What are you making today?" in English.
Aujourd'hui in French means "today" in English.
"Not today, sir!" in English is Pas aujourd'hui, Monsieur! in French.
"Today's lessons" in English is les cours d'aujourd'huiin French.
"Today" in English is aujourd'hui, pronounced "o-zhoor-dwee," in French.
"I have missed you today!" in English is Tu m'as manqué 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.