A German Phrase for Asking About Someone's Birthday: "Wann hast du Geburtstag?"

"Wann hast du Geburtstag?" means "When is your birthday?" and it's the basic German expression used to ask someone when their birthday is. It's a handy conversation starter. To answer, you can say something like "Ich habe im Mai Geburtstag." (My birthday is in May). To wish someone well, say "Alles Gute zum Geburtstag!" (Happy birthday!).