At the beginning of broadcasts, I've heard things like, "Bonne journée. Nous sommes le mercredi 24 janvier 2024. Commençons notre programme."
Is the "Nous sommes" used formally, or conversationally as well?" Would a teacher say "Nous sommes..." rather than "C'est..," for example? Or if a friend asked for the date, would it be odd to say, "Nous sommes le 24 janvier?