Formal:
* Aujourd'hui est... (literally "Today is...") This is the most direct translation and is suitable for formal settings.
Informal:
* C'est...aujourd'hui. (literally "It is...today.") This is a more natural and common way to express the idea in everyday conversation.
Examples:
* Aujourd'hui est mardi. (Today is Tuesday.)
* C'est mon anniversaire aujourd'hui. (It's my birthday today.)
* Aujourd'hui est un beau jour. (Today is a beautiful day.)
The choice of which phrase to use depends on the context and the level of formality.