A French Phrase for Asking About Someone's Birthday: "C'est quand ton anniversaire ?"

"C'est quand ton anniversaire ?" means "When is your birthday?" and it's the basic French expression used to ask someone when their birthday is. It's a handy conversation starter. To answer, you can say something like "Mon anniversaire est en mai." (My birthday is in May). To wish someone well, say "Joyeux anniversaire !" (Happy birthday!).